Would you trade your home built bike for an optibike?

Geeze, Dude, you are really a piece of work. For one thing, 800 watts is a 1C charge rate of a 800wh pack. That would be a 44 volt nominal (12s) 20 ah pack. Most Lipo packs are good for at least 2C charge rate.


Your arrogance is really offensive.........





I totally give up. This is completely useless.

Matt
 
extremegreenmachine, Optibike should give you one, for being their most fanatic preacher. :wink:
 
I hope he gets bored with it next week, then maybe I can buy it, even if I have to dig some cash out of my Ferrari savings fund to buy it. :roll: :D

When one can buy a new 70mph Vectrix for $3,000+, it is hard to justify the price. I still want an Optibike though. Haven't seen fit to drop the cash, but I can appreciate the aesthetic. If it can be made cheaper hopefully some inspired craftsman will see the opportunity and fill the niche of a MBB bike at a price point a larger market will buy. Till then, against all logic, I want an opti.

-JD
 
Oatnet, its for sale....7k takes it and your welcome to it...got all i wanted out of it. Will sale it in a flash at that price.

Matt, sorry again to offend i value the information you are giving... I am just a humble reviewer of the opti i just got...sorry but i do have a back ground in building and selling electric bikes (not my proudest moments)...and i just mentioned it because i felt i was being steamrolled by you. You know how on a recumbant bike you dont get hit you get run over...i feel i was being run over just for saying postiive things about my bike. I mean how dare i get "gushy" about finally getting my hands on a 12k bike. Forget that i also highlighted its negative features very very clearly. i guess some get jealous when you write anything positive about an American company competing in a chinese ebike market....i mean crap you almost reported me as a spammer. :p But dont want to make you mad since i think you are the only american who has access to a 450 dollar 20ah 48 volt high discharge lipo pack....you deserve to be arrogant and rich if you have those kind of hook ups. Please post your lipo connection...share with your fellow diyers...dont be a hater. Also i really really appreciate your building your own mid drives here in America...you are doing really whats right and to have those kind of skills and put them to use here is very very valued. I hope you are making a living building electric bikes and if your not more power to you to do it in the future..america needs you..seriously. Invent your own nich.

HIllhater,

Im being consistent.

I started this thread saying i would trade my favorite 6k bmc build for an opti in a flash...then suddenly a poster informed me that an opti was for sale on craigslist and i made a "ridiculous" offer and after 2 weeks the offer was accepted. I tried the bike, rode it for 3 rides...and then said very clearly that i like my bmc "boutique" bike much much more for my type of riding.


Now that i have ridden a opti and tried it i wouldnt trade my bmc build for an optibike...i love the performance of the bmc...which is spent 6k on. I spent 7k on the optibike and plan to sell it based on my disappointment. But the bike really says quality. It is really built well and i can see how for some people who want a commerically viable product and who ride primarily rough trails, want a reliable, efficient and lightweight machine...i can see how someone could spend the money. If you want an electric chairlift that will get you to the top of the mountain and weighs less than 60 pounds and then you can bomb down on a well balanced bike...the optibike is the bike for you. It is an efficent tight build....but it is also underpowered and noisy and expensive....my review was real...i reported both the positives and the negatives. And then matt steps in who probably has never rode an opti bike and says how ridiculous and insulting it is to even think about buying one.

It is not a "rip off" at 10-12k and for people who dont have building skills or friend set to get a custom bmc or crystalite, or 9c and then maintain it, the opti is a very good option...for people who want a warranty, a person on the phone for technical support etc etc etc.

I am not that guy...i ride mostly on fire trails and roads. The hub motors work good for me. I dont like to be noticed when i am on a electric bike..the noise really really bothers me. I have found out that stealth is even more important than i thought. I hate the type of attention i get on the opti..it is obviously electric and it looks very very expensive. I wonder if matts boutique builds look that expensive...but the opti gets noticed and i dont like that...i am ashamed to ride expensive looking stuff.

i know there are some boutique builders out there who value my findings or who would like to get ahold of my opti for a few days for dissection. It is one of the cleanest mid drives made. So rather than attack me i think the wise boutique builder should be squeezing more info, pictures, etc out of me. As matt said...listen instead of talk...cuz right now i am the only one on es with a 850r opti :D

Here is a race against my bmc boutique and the opti...the bmc smashed it...hill was not steep enough for opti to win:

http://www.youtube.com/watch?v=kR3sPmXi334&sns=em
 
I wold like to add my review as I own a Optibike and they are not the fastest bike and I peddle all the time to achive top speed which is 32 mph
most of the time I cruise at 20-25 mph and they are a good solid bike and I think they are over priced! but so are all the exspensive cars you see out there
all over priced.... give me a electric nissan leaf anyday!!
 
Green,

One of the only parts of my bikes that are not sourced (manufactured) in America is the pack. I use 5ah 6s packs in a series parallel arrangement. I use packs from Hobby King. You can get a 6s 5ah pack for $49. That would be $392 plus shipping for a 12S 20ah pack. Many guys on this board use them.

Honestly, I would take a Opti is I could not build bikes and they were 1/2 the price. I do like the design quite a bit. WIthout the rear fender, they look cool, too.

At any rate, I hope the argument is over. :D

Matt
 
Matt thanks a lot for hobby king info...yep arguments over..i think we agree on many points anyway...kind of silly.

Thanks stevebills for your comments. i cant imagine if the 850 feels underpowered what the 600 must feel like.

I heard that this thread is being followed by the opti google group.

If there's any opti riders from the optigroup reading this...please register and post your opinions and review on the opti.

Obviously there are lot of opti haters on this group...so it could help to get reviews from people who own them and ride them. Is the opti worth the price? I think its obvious its a quality bike...but with this group of hard core esers even that is debatable...help me opti guys!
 
recumpence said:
At any rate, I hope the argument is over.

Matt,

Yous guys aren't as far apart as the heat would signify. The $$$ are basically a difference between someone who does mostly one-off boutique business with limited future support, and a company with full support, insurance, lawyers, patents, and a small mass business. I've gotta tell ya, I found your interactions with Green and the bulk of this thread extremely fascinating and I thank you both and everyone else for it.

Ron Shook
 
extremegreenmachine said:
Obviously there are lot of opti haters on this group...
Not hating, just finding it not meeting performance requirements, especially at such a price. I can build a 30HP electric motocross for that kind of money.
 
It is obv tht it would be super easy for opti bike to upgrade to 72 volts and put a beefier rc motor (probably dont even need that) and get 50mph top speeds and unbelievable hill performance with that rohloff gear range...and keeping the weight under 60lbs, and still have a super tight-looking balanced package.

I am sure they could do so without even raising there costs too much on the build...and then sell a ton of them with there advertised 40-50mph top speed.

I am sure the reason they havent yet is there lawyer told them "hell the f no". Even if you threw liability out the window and figured people would be cool when they ended up in emergency rooms and wont sue you... there is a big question on how long motor, batteries, components etc will last especially riding off road conditions....just think about how bad of a proposition it is for someone trying to make a reputable company.

Thats why maybe high performance multi horse power builds will always be reserved for the ES guys and the boutique builders. Maybe thats why you can only buy parts for high performance builds and not complete bikes.

Someone here on es hotrodded an opti to 72 volts with a leon controller and shot some video..it looked like it was going atleast 40mph and unreal acceleration...here is a link
http://www.youtube.com/watch?v=4PdSUzwCw_E
http://www.youtube.com/watch?v=XhZhmj3gREg

Later i will take pictures of there motorized bottem bracket...its a super tight nice looking package...its around 4 inch square and looks to weigh less than 5 lbs...the cranks are built into the package.

The opti would be terrific platform to squeeze such horsepower out of...but its so expensive i would never break it open. :D

By the way you want to see the opti in its best suited environment..here is one riding offroad....this shows the handling of the bike in trail conditions..its best suited environment.

http://www.youtube.com/watch?v=XhRhx2WRq2w&feature=player_embedded
 
I too thank extremegreen for the detailed reports on the Optibike and consider his reflections/reports among the most honest and thorough I've read to date on the internet--and I've followed Opti from day one and am a manager at the Google Tidalforce Forum, which was home to Opti owners for several years before they set up their own forum, which I have also followed closely from its inception.

The price debate needs to be put in perspective. Just last weekend I saw a stock lightweight XC mtb in a bike shop window in upstate NY and saw nothing particularly special about it, though I'm sure it was a weight-weeny wonder. The pricetag? A cool $8K, more than the original Optis cost by about $2000.

The fact is, Jim Turner has every right to charge dearly for his machines given the risk capital, blood, sweat and tears he's put into these bikes; he also singlehandedly invented and defined the high end turnkey e-bike segment years ago when Grace and all the others were still an engineer's wet dream. No one is forcing anyone to buy these bikes, and the hostility some of the ES members here show towards these bikes is unwarranted and not very mature IMO. If it's not your cup of tea, just state briefly why not and move on. Optibike deserves to make a reasonable profit on each and every bike it sells, and as someone else posted here, they have been discounting their prices somewhat aggressively in this economy, so I doubt if many pay the sticker price.

Separately, comparing an electric motorcycle to an Optibike is not very helpful IMO--they are two completely different machines aimed at very different markets. A 30 hp e-moto bike will probably weigh in at 3-4X the weight of an Optibike, maybe more--and I'd love to know the range on it when ridden aggressively. Optibike is an e-assist bike that tries to mimic the ride of a non-e road bicycle as much as possible and obviously you are paying for light (well, as light as possible to do the job) premium parts on a semi-custom U.S. made frame with a U.S. warranted battery pack to boot. (I run high-powered hobby grade lipolys on my S750X and will testify that they will certainly NOT go 3 years or 30,000 miles, which is Opti's warranty. In fact I just killed a triple set of True Rc 10C 8Ah lipolys last fall after less than two seasons and 200 cycles, so recumpences cost comparison is a bit skewed in this department IMO.)

All in all I've enjoyed this debate and commend extremegreen for contributing some very helpful information here that can't help but aid a prospective Opti buyer into going into a purchase decision with eyes wide open. Frank informative owner reports such as his are not always easy to come by and enrich forums like these tremendously.

Peace and happy miles (no matter the ride),

Larry Hayes
 
First off, Extreme posted his opinion, I posted mine as did others and Extreme would not move on. That is all. I was violently attacked, though I proved my point repeatedly on the various details I described. Why do you not find his response immature? Second, true RC packs suck badly. I agree with you there. However, we have tested the Turnigy packs for IR at various temperatures and rated capacity. These are, believe it or not, among the best packs we have tested. If you want detailed reports on this email Tom at FFR trikes for specific information. I have had Lipo packs for over 6 years that are still going strong. It is all a matter of how they are used. In an RC application, packs get beat to death. In a bike, they are not run so hard and tend to last a very long time.

I understand the interest in defending a company for filling a niche. However, lets be frank and call a spade and spade. Just because a product is the first of its kind does not make it free from ridicule or concern in various areas. And I truly take issue with people who post incorrect data whether it is regarding battery technology, motors, controllers, or complete bikes.

Why is it so difficult for people to take ANY negative comments what-so-ever regarding products? This I find complete appalling and, in your words, immature.

The issue I have with the Opti is one of cost, period, and I am one of those who is willing to spend ALOT on my toys.

We are free to disagree about the cost. To some, it is fine, to others it is not. However, when someone posts information regarding battery technology, motors, or something else that is incorrect and they are corrected, do not blast back, but take the correction as a learning experience and grow by it. If I had not taken advice from others on this forum regarding various aspects of builds and product development, I would not have advanced my own knowledge.

For whatever reason, some products are violently defended while others are not. That is the affect of a cult following. I designed and manufactured a product to reduce inherent frame flex at the rear of some Catrike models. When I posted my findings I was attacked like I cannot even truly communicate! However, when I posted upgrades for KMX trikes, they were accepted without question.

Some products garner differing responses from individuals that others don't.

Matt
 
<<I understand the interest in defending a company for filling a niche. However, lets be frank and call a spade and spade. Just because a product is the first of its kind does not make it free from ridicule or concern in various areas. And I truly take issue with people who post incorrect data whether it is regarding battery technology, motors, controllers, or complete bikes.

Why is it so difficult for people to take ANY negative comments what-so-ever regarding products? This I find complete appalling and, in your words, immature.>>

I think we're on the same page here and that you're confusing me with another poster. Either that or I'm missing your point. Here are mine:

1) Ridicule towards a product that many have found fits their needs perfectly (see the Opti Google forum) seems simply hostile and ill-informed to me on a forum that purports to support e-bikes of all kinds, period. There are a bunch of Opti owners who are thrilled with their ride and they deserve some respect IMO--or at least a fair hearing. My beef was with the ES poster here who dismissed the Opti as "an over-priced POS," or something to that effect. This kind of rude dismissal serves no productive purpose as far as I can see, and should be called out, which is what I did.

2) There is absolutely nothing wrong with pointing out the weak points of any e-ride--in fact I encourage it. If you go back on this thread you'll see that I am not an Opti owner and probably will never be unless/until they make the ride far quieter, so if you're talking to me re rejecting negativity you're barking up the wrong tree.

Let's just have a civil and rational discussion of the pros and cons of all e-bikes--after all, I assume that's what this forum is all about.

LH

P>S> The True RC packs performed flawlessly for me while they lasted, with extremely minimal sag (about 2V). I fault myself for occasionally drawing them down well below the 15-20% reserve. But the packs themselves were kickass and the best I've seen to date. That said, perhaps the new Turnigys are even better given the RC's were bought two years ago and I'm assuming the tech gets better by the day.
 
I doubt you will get an unbiased view of the Optibike from the Optibike owners forum ! ..
..Its human nature to justify & defend your decision to buy a product.

Whilst i would not belittle Jim Turners achievements,..he has done much to be admired ..i would question some of the statements made , such as...
..he also singlehandedly invented and defined the high end turnkey e-bike segment years ago ..
..I find that odd, (depending on your definition of "high end" i guess), as there were quality Ebikes around in the late '90's ....before he even rode his first one (according to the Opti site) ?
Most notable in my mind would have been the Aprilia which not only was a quality product, but interestingly , also had an integrated motorised Bottom bracket ! ( and an alloy frame with an enclosed battery & controller !! ) :roll:
I also wonder exactly what it is that Optibike have "patented" about the Motorised bottom bracket, since it doesnt appear to introduce anything new to the concept ? ...and was certainly pre-dated by the 15 year old Aprilia design. !
 
extremegreenmachine said:
I am sure the reason they havent yet is there lawyer told them "hell the f no". Even if you threw liability out the window and figured people would be cool when they ended up in emergency rooms and wont sue you... there is a big question on how long motor, batteries, components etc will last especially riding off road conditions....just think about how bad of a proposition it is for someone trying to make a reputable company.
I think it's less a problem of liability (a well constructed waiver can do wonders ;) ), but rather a problem of legality. At least in the US, there is a huge variety in what different states consider legal or not for an ebike (on-road). Because of this, if a company wants to sell an ebike and advertise its use on the road, they have to meet the least common denominator.

deerfencer said:
No one is forcing anyone to buy these bikes, and the hostility some of the ES members here show towards these bikes is unwarranted and not very mature IMO.
IDK about anyone else, but I haven't seen any hostility at all towards the Optibike or its makers anywhere in this thread. The majority of the controversy has been in response to extremegreenmachine's repeated claims that the Optibike is the most capable ebike in the world for certain tasks, and that various parts are 'the best', 'revolutionary', and whatnot. Claims which were repeatedly refuted, and which he responded violently to. I'm not trying to re-open anything, just pointing out my observations as someone who has absolutely no stake in the argument (don't have an Optibike, never will, for lots of reasons, just not interested).

From what I can tell from this thread and a couple others, the Optibike seems to be a very well made, well polished machine, with a lot of attention paid to the difficult mechanical aspects of it. ...unfortunately, when it came to some of the electrical bits, they seem to have taken a holiday. Case in point, the drivetrain. Reportedly a very well done gearbox/etc; mounting, linkage, everything, well done....and then they stick a noisy, underpowered motor in it.. Really, the motor is the biggest point I don't get on it. They could have easily put in a more powerful, quieter motor and electrically limited it to whatever speed/power they wanted, kept it perfectly legal, and addressed all of the problems that extremegreenmachine has mentioned about it. Blast me if you like, but when I see a product built up as much as the Optibike is, I expect to see great care and detail in every aspect, not just most. It's like if Ferrari had to release the 458...with a 1.5L straight 4 engine... Beautiful design, great handling, gorgeous interior...but no power.
 
Regarding responding violently...i am sorry guys i tend to do that when blatantly provoked...there has only been one poster that had really gotten under my skin...

Hi Matt,

Just as i was thinking we were becoming friends :)....you want to continue to argue.

Your posts really befuddle me. I dont know where to start. For one thing i feel i was attacked by you and others by just doing a riders report in which i reported both big pluses and big minuses to the optibike. Its obvious from this thread that people are interested in optibike so why not just let me have my fun. I am spending big time on these posts just to share info on a bike i am excited about...no reason to belittle me. You in particular were like kindergarden cop in your tone...but thanks for still allowing me to post.

There are so many wrongs in your posts...let me just focus on the most critical because it will bring my argument full circle on why the opti is costly compared to a boutique es build. ALso it might end up saving a life or two and saving you a ton of legal hassle...maybe even jail time. :p You can thank me later.

You said in your last post this: "And I truly take issue with people who post incorrect data whether it is regarding battery technology, motors, controllers, or complete bikes."

I take particular issue with hypocrisy and i am assuming you are taking issue when i called charging 48 volt lipo batteries at 800 watts "insane".

You retored with this "Geeze, Dude, you are really a piece of work. For one thing, 800 watts is a 1C charge rate of a 800wh pack. That would be a 44 volt nominal (12s) 20 ah pack. Most Lipo packs are good for at least 2C charge rate."

I let all this go in the name of peace......but i still think your totally insane for selling this stuff...

Even running a real lipo pack designed for ebike applications with a bms and lower discharge cells is considered risky. These packs are expensive like this one 800 bucks for 10ah pack: http://www.batteryspace.com/highpowerpolymerli-ionbattery518v10ah518wh40adrainrate.aspx

To strap together big rc packs and make one giant pack is dangerous....to sale them with a 800 watt charger to the public is absolutely wreckless, negligent, and insane.

Have you ever noticed that rc chargers for big packs do not have a 110 outlet only 12 volt terminals? You ever wonder why? They are too dangerous to be charged indoors even in a garage. So when you sale one if you provide a rc charger like the rc packs were designed for...your customer is going to be charging his 8k bike leaned against his car with the motor idling so that rc charger doesnt drain his car battery...what a picture. But you are suggesting something even more ludicrous and dangerous. You are selling to your customers a Zivan charger $575 designed to charge an electric car battery..with a 110 outlet...so inside the house or inside the garage.

The few bike companies who dare to sale lipo in there bikes like optibike use very high quality batteries contained in metal encasing, and do not provide the bike with larger than a 150 watt charger...charging the pack at 3amps (48 volts x 3 amps = 150 watts .3c). They do this for fire safety. For you to offer customers a virtual fire bomb of a pack and charge it at 14amps with no bms and a charger designed for electric cars is insane. I cant even imagine what precautions you would have to take to sale such a thing. With the law of averages my (generous) guess is for every 100 packs you sell you burn down a house...for every 500 packs you burn down an apartment building. My guess is you would average one death by fire for every 100 packs you sale with that charger. If i were you i would talk to an attorney and see what exactly your liability is selling something so dangerous.

I would think 3rd degree murder and wreckless endangerment would be included in losing everything you own in the event of an aparment fire started by one of your products. Not to mention the embarrasment to your sphere peers. I think that this thread might be used ad evidence against you since you pretend to be such a know it all. Its hard to play dumb when you have threads like this warning you blatantly and you choose to ignore.

IT is one thing to play it on the cheap for products your build for yourself..but even then i would have a big problem if you lived in the same apartment complex with my family knowing you are taking that kind of risk...but unleashing something like jankey lipo packs on the public and making "a pretty penny" i would consider extremely negligent. Imagine how pissed someone would be if they spent 7k on one of your boutique builds and they lost there house because of it. Lithium technology is nothing to mess around with. Its fine for experimenting here on the sphere...but selling to the public god help you.

You have to get together with a liability specialist to help you imagine all the possibilies of what can go wrong. For example i would suggest you build for all your customers a giant gun safe if they have teenage kids in the house. Lets say you play it on the cheap es style and just supply every customer with a giant bike sized fireproof bag and a kryptonite lock. A teenage boy is capable of copying your krypto key down at the hardware store while you are in the shower and next time your at work take your lipo powered tadpole on a joyride...but wait its not charged...let me plug it into dads 575 dollar 800 watt charger... this pack will be DONE in a jiffy. Oh how do you set this thing so many buttons..ok think i got it...now while i am waiting i will go back upstairs and smoke a bowl, drink a beer, watch some tv...have a nap on the couch...pow...popcorn. those kind of scenarios...you need to build a giant gun safe and call it a childproof fire locker and make sure you fit it with an electronic combination lock you can change once in a while...or better yet...i think you should just stop selling rc lipo packs to the public right now before you kill somebody and wreck it for all of us.

In fact Matt, i think its time you stop hanging around your computer and get in your rolodex...and do what they call in the business a "boutique recall". I would not want a single rc pack build out in the public hands that you built if i were you. The risks are tremendous...despite what you think you read on the sphere. Let your customers buy their own packs from hobby city, and pay with their own credit cards, and have them illegally shipped from china (illegal to ship lipo packs to US from china) to their addresses. I really hope your listening matt...because when you order lipo packs and have them shipped to your house you are breaking the law and there is a permanent record of that....if someone dies...if a child dies in a fire...you broke the law and someone else paid the price...i guarantee it will come back to haunt you...especially if you made a "pretty penny" in the process.

After you get done with your recall you should spend some more time reading here on the sphere instead of flaming...and read up on lifepo4 technology...and even then...with the negligence you have just shown i think you should be demoted to lead acid for a while until you truly understand what selling a 8 thousand dollar 40mph fire hazard to the public implies. If your vehicle is not bicycle legal...then in most states it would just be considered an unlicensed motor vehicle. Seriously I would stay away from complete bikes and just sale parts for a while until you talk to a good liability lawyer so atleast you know exactly what you are risking. Sounds like a lot to me.

Maybe after you have read a bit you will appreciate the safety precautions companies like Tesla take. Each cell is in its own fireproof resin so that if one cell blows it wont start a chain reaction. Maybe you will finally understand why optibikes cost 10k....and how they got away with using one of the most dangerous chemistries in a battery...and still build a bike that is perfectly safe to charge inside a house.

Maybe you will understand how a 450 dollar 20ah 48 volt lightweight and safe battery is an impossibility...and if it were possible you would see small electric vehicles everywhere...

Sorry dude..no offense...but you need to get busy on your boutique recall RIGHT NOW.
1257243243516_373.jpg
 
Either someone can't read or they've missed this post re hostility towards Opti:

<<Overpriced POS.
My $2500 homemade electric chopper has 10x's the style, and 3x's the distance at the same speeds as that piece of "artwork" someone on another site said it best..

The ONLY reason to buy that bike is because of the "exclusivity" of it since they only make a couple dozen a year.
It's for those people that have money to burn and what to show it off.

I would NEVER buy one, unless it was priced at $1,000 and even then, I think I would have paid too much.>>

Ok, it's one guy's opinion but very crudely put and without substantiation. How does this add to an intelligent debate here--I'd say it doesn't.

Separately, re high end e-bikes in the 90's--Aprilia??? Are you kidding me? They were in business for a very short time and failed for many reasons, mainly that their product didn't deliver.

LH
 
deerfencer said:
Separately, re high end e-bikes in the 90's--Aprilia??? Are you kidding me? They were in business for a very short time and failed for many reasons, mainly that their product didn't deliver.

LH

It all a matter of personal opinion, but...
...how did it "fail".. ?
I wouldnt call a product being on the market for 8 years a.. "very short time" ! ( & Aprilia are still very much in business)
What didnt it deliver ?
.. ( remember it was designed to meet the Euro spec of 250W max !) .. and limited by the technology available at the time (mid '90's design, so Nmh batteries brushed motor etc)
 
deerfencer said:
Either someone can't read or they've missed this post re hostility towards Opti:
Nothing you quoted is hostile. -_^ Touchy much? (ok, 'POS' maybe...but why bring the rest into it?)



Oh, and extremegreenmachine, you seem to be severely misinformed about a loooot of things, especially regarding battery technology.
 
Oh right someone forgot to inform me how safe rc lipo packs really are when strapped to a bike and charged in a house on a big ass charger....damn....i will keep up on the reading and try to get more informed but if you have time please enlighten me....cuz i am dying to get my hands on a 72 volt light weight and dirt cheap lipo pack for my next build. BMS's are for wusses :twisted:
 
extremegreenmachine said:
Oh right someone forgot to inform me how safe rc lipo packs really are when strapped to a bike and charged in a house on a big ass charger....damn....i will keep up on the reading and try to get more informed but if you have time please enlighten me....cuz i am dying to get my hands on a 72 volt light weight and dirt cheap lipo pack for my next build. BMS's are for wusses :twisted:
http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=19956
 
Just to be clear i love lipos, have 4 10ah 48 volt lipo packs with bms's and 3 amp chargers. I am very careful with them and how i charge them and know and have experienced the risks. I think the chances of an accident are slim when set up properly and in the right hands.

I think it is possible to abuse lipos. And selling to the public high discharge rc packs strapped together with no bms with a big programmable charger i think is negligent...of course i could be wrong..i have said stranger things like liking the optibike. But it sure seems like asking for trouble to me.
 
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