Search found 2383 matches

by agniusm
Nov 26 2011 4:07am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

How do you know the cells are below 1V and dropping? Have you tested them? This really surprised me? Did you sell those cells to agniusm? Yea, the guy probably went posting without reading and watching the video. I doubt he sold me those cells as the man who did was very poor in english, possibly g...
by agniusm
Nov 25 2011 5:45pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Thanks. Now cellman states that he is selling A grade cells but they are a lot cheaper than you could get from mazive buying more than 1000, there fore are they realy a grade ? :) Does not matter at the end if they are matching cells and he has good feedback from a customer.
by agniusm
Nov 25 2011 4:05pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

thanx alot guys. well, if i could get 25m range with cargo i would be pretty happy. sweet spot is 30km range with cargo and if it is few miles extra, all talhat is great. maybe it will be posible to go 50 60 without cargo. as i see it most important thing i battery pack because everything else is ch...
by agniusm
Nov 24 2011 6:50pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Headway cells and Ping packs are far from crap. Just you bough A123s (or so you thought), so we were advising you expecting you were looking for the kind of performance those cells can provide. Headways and Pings are both tried and true cells to use, you just have to keep it in perspective what the...
by agniusm
Nov 24 2011 6:00pm
Forum: Battery Technology
Topic: Help for those wanting similiar to a123
Replies: 12
Views: 1816

Re: Help for those wanting similiar to a123

From my point of view ther cells are a bit mixed bag. i have not tried them but max and burst disscharge rates are in wide brackets if i can put it that way. second thing they state more than 90 percent capacity only after 190 cicles?
by agniusm
Nov 24 2011 5:20pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Check out cell-man's packs, he makes good quality packs! http://www.emissions-free.com/catalog/i28.html I would go with 2 52 volt 11.5ah packs and they would more than meet your needs, I don't think you need the speed of 72 volts, I think you need to make a compromise I have checked the site provid...
by agniusm
Nov 24 2011 3:50pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Thanks. I am planing on building prototype at this stage, later would like to make a production bike that is not just a bike but a handy tool for business carrying goods locally, post man transportation etc. I am looking for speed @ around 60-70kmh optimally. Weight say 70kg rider + same cargo maybe...
by agniusm
Nov 24 2011 1:45pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Yes LiFeP04 will give you longer life but the extra weight and bulk is not worth it in my opinion. A 48 volt 20ah ping is the absolute maximum size and weight of a battery I would put on a bicycle, unless you can find plenty of room on your bike ? If I were you I would get 16kgs of weight and put i...
by agniusm
Nov 24 2011 1:39pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

From what I have heard, these are more comparable to a ping cell than a A123. In other words, for best lifespan, 1c, perhaps 1.5c discharges is the target. So you better be planning on a 20-25 amp controller for a 20 ah pack of those. They have proven to be a reliable battery, but not for high disc...
by agniusm
Nov 24 2011 1:12pm
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

Holy Cow that's expensive, and heavy ??? How about 12 of these ? http://www.hobbyking.com/hobbyking/store/__19717__ZIPPY_Flightmax_8000mAh_5S1P_30C_DE_Warehouse_.html About 12 kgs and around 1000 usd, leave it sit long enough and they drop the price! 20s 3p would give you about 74 volts nominal and...
by agniusm
Nov 24 2011 5:28am
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

Re: What 20AH battery pack to build?

So here is what i would get for trouble free pack:
GBS-LFP20AHA (4-cell Pack) x 6 - 744USD
EMS-CPU (with CAN) x 1 - 240USD
EMS-4SB x 6 - 396USB
EMC72-10 x 1 - 336USD
Total: 1716USD + shipping + charges
Expensive, but if that is all good for 6 years...
by agniusm
Nov 24 2011 5:05am
Forum: Battery Technology
Topic: What 20AH battery pack to build?
Replies: 45
Views: 3774

What 20AH battery pack to build?

So after my misfortune with Chinese A123 seller i have started digging to see what else i could use easy acquireble on todays market without spending too much money. Someone here back home was testing CALB and thundersky batteries and the news were pleasing. Dont know the details, what i know that C...
by agniusm
Nov 24 2011 2:37am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Thanks, well i hope it will all go fine, fingers crossed. The only thing i have stated that they ate copies of originals, internally damaged. On my conversation on paypal with seller he agreed that they are not the ones we where talking about before purchase. Mavizen site is also stating that they a...
by agniusm
Nov 23 2011 11:58am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Thanks. will be comming back in some time with my project as soon as i begin.
by agniusm
Nov 23 2011 10:41am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

your video showed cells holding 3.3V but you said they were all around 1V and down to the .3V you discharged into the voltmeter in that video. if you could make a similar video showing that the cell will not take charge from a single cell charger then maybe i would believe you. you have had a numbe...
by agniusm
Nov 23 2011 1:47am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

I would personally charge them to see what happens can do a capacity test followed by a test to determine if they can discharge as you would like to normally. Iv had A123 headway thundersky calb and others.. iv just about had a cell from each go to 1.50 volts and i slowly charge them back up to the...
by agniusm
Nov 22 2011 3:28pm
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Got some results. 4 Korean cells where tested. We have tried to charge them with lab PSU and they would not take any charge, 0 AMP's. Taht"s what i thought, kaput.
by agniusm
Nov 22 2011 2:34am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Hi. I have to go to capital. There is someone with lab equipment to test them. I will get more info on the cells here when i have test results. Somehow i doubt that they will perform thou
by agniusm
Nov 20 2011 7:12pm
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Could someone brake it down for me the trick with bulbs to test the cells. Should i connect say 4 cells in series and then hook up some 12V light bulbs in parallel? What then? So i have a meter connected and keep checking on the voltage as well as time?
by agniusm
Nov 20 2011 6:29pm
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Thanx. My brother has a charger for cylindrical lithium cells he got with hes gun flashlight. I wander if that would suit? Here is that set: http://www.ebay.com/itm/UltraFire-CR123A-7-4V-Xenon-Flashlight-Battery-Charger-/150610500653?pt=US_Flashlights&hash=item231115dc2d#ht_5272wt_1063 , it says tha...
by agniusm
Nov 20 2011 9:47am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

i will see how it goes with paypal. If all good i am considering Headway route. I will lose on weight 8kg's but it looks like there is less confusion with them. I cant experiment with the cells cause by the time i will source and ship the charger my paypal claim date will expire.
by agniusm
Nov 20 2011 6:46am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Made a small video:
by agniusm
Nov 20 2011 4:39am
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

Thanx for your input. I guess i knew there was risk involved. Not true that you cant get genuine A123 cells but at what price. In Germany its 60 euro per cell http://shop.lipopower.de/A123-Systems-AMP20M1HD-A-20Ah-Folienzelle I wonder now, on that site they are marked as USA cells. Does any one know...
by agniusm
Nov 19 2011 6:16pm
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

I think its a bit early to say if i will get refund from paypal or not further more this is my personal matter. Next thing, i have attached a document with cell voltages, individual numbers and a person can make judgement on that, i supose you missed that. I understand what you mean, but the thing i...
by agniusm
Nov 19 2011 5:22pm
Forum: Battery Technology
Topic: A123 from China. C and avoid [SOLVED]
Replies: 149
Views: 21083

Re: A123 from China. C and avoid

did you ever charge these cells and try to determine what the internal resistance is and what the capacity is of the low cells versus the cells that remained fully charged? is there a date stamp on any of them to indicate how long since they were manufactured? this knowledge is more important than ...