Zippy Flightmax / Turnigy lipo testing

[Hyena]

Damn, are they even worth the cost of a charger to use them more than once for that price ?
As the price keeps tumbling I'm thinking about them on an e-motor bike too.
I even started doing silly calculations about how many I'd need for a small car. All will be well as long as no one rear ends me!

 

[jondoh]

When I sold the EV Bug to Methods, he brought over his 66v 30 ah pack (3 x 6s x ? P). i figure it would push the bug (which is a very light car) about 6 ~ 8 miles with a top speed around 45 mph. I'm using 72v 100 ah LiFePos in my electric car which is good for at least 25 miles and a top speed of 53 mph ('92 Tercel).

I haven't heard from Methods in a while. I wonder how he's doing with the bug?

 

[Hyena]

Has methods posted about this elsewhere ? I may have just missed it but this sounds like the big project that's been occupying him! I think you just let the cat out of the bag jondoh

 

[methods]

hi
looks like I've joined that growing list of ebikers who have smoked their fingers putting the batterys together the wrong way.
Geoff

Jesus Geoff.... my KFF was just a little powder burn - - - you frigging cooked the meat right off of your hand

New short: KFH - Kentucky Fried Hand

I think you just too first place for KFF buddy that looks paaainfuuuuul...hope it
heals up quick for you... :: touch wood :: i wont be joining that "elite" club anytime soon.

KiM

Pffffft
Whatever your ridiculous kangaroo! You will be the the ALL TIME GRAND CHAMPION.
Why dont you show us that little job you did with the welder a year back ???


As far as the bug?
I am getting some good mileage out of that pack but it leaves a lot to be desired.
I have had a few mishaps - you can get away with having cells parallel at the cell level but not at the power level on an ebike - but NOT in an electric car that pulls 400A!

This is why you want the silicone balance taps and not the PVC that come on the Zippy.
The pack came out ok.

I am working a deal for 24 100Ah TS cells as we speak. Shipment should be in by the end of this week.

but... the bug (unfortunately) is not what has been eating up all my time.
THIS is

View attachment 2




And before anybody asks - NO it is not going to be for sale here and NO I wont answer any questions about it
This is a singular prototype that will never see the light of day - like James Bond - "For Methods Eyes Only"


-methods

 

[AussieJester]

Pffffft
Whatever your ridiculous kangaroo! You will be the the ALL TIME GRAND CHAMPION.
Why dont you show us that little job you did with the welder a year back ???

How can a fire burning a foot that has no feeling be remotely related to a burn caused while having 'supposed' full
knowledge of what your doing Patrick? You continually burning yourself connecting up battery leads
... some would classify that as being a slow learner...

KiM

 

[El_Steak]

And before anybody asks - NO it is not going to be for sale here and NO I wont answer any questions about it
This is a singular prototype that will never see the light of day - like James Bond - "For Methods Eyes Only"

C0ck-tease

 

[Hyena]

Whatever your ridiculous kangaroo!

hahah

Very cool BMS Methy! Hey I don't suppose you...

NO it is not going to be for sale here and NO I wont answer any questions about it

Oh, never mind...

 

[methods]

How can a fire burning a foot that has no feeling be remotely related to a burn caused while having 'supposed' full
knowledge of what your doing Patrick? You continually burning yourself connecting up battery leads
... some would classify that as being a slow learner...

KiM

Wow - did I actually hit a sore spot? (no pun intended)
Was it the kangaroo reference?

I patiently await your KFF, KFH, KFD, and KFK (Kentucky Fried Kangaroo).
THEN we will see who the slow learner is

It is a percentage game mate - I probably plug lipo packs together several thousand times a year. You poke anything that many times in a year and you are going to come out with a burnt appendage eventually.

-methods

 

[AussieJester]

Wow - did I actually hit a sore spot? (no pun intended)
Was it the kangaroo reference?

...not at all, But i did ask a question that you have obviously side step answering

I patiently await your KFF, KFH, KFD, and KFK (Kentucky Fried Kangaroo).
THEN we will see who the slow learner is

Good luck with that, hate to be the spoiler of your fun waiting game, but my packs built KFF free and i wont be building another for a loooooong time Methy, guess you better get comfy

It is a percentage game mate - I probably plug lipo packs together several thousand times a year. You poke anything that many times in a year and you are going to come out with a burnt appendage eventually.

Really...in my experience the more one does something the better one gets at it...oh wait...you do burn your fingers with consistent regularity...nevermind

KiM

 

[GGoodrum]

You poke anything that many times in a year and you are going to come out with a burnt appendage eventually.

Your new bride can't be too happy about that... :lol:

 

[Arlo1]

Your new bride can't be too happy about that... :lol:

:lol:

 

[recumpence]

You poke anything that many times in a year and you are going to come out with a burnt appendage eventually.

Your new bride can't be too happy about that... :lol:

Not to take this thread too far off topic, but, I side with Gary and Kim on this one.

The more I, um, "Poke" the better I get.

Seriously, though, very nice BMS, Man. I love it!

Gary, I am looking toward my goal of finishing up my new trike/kart in a month or so. Can I get a BMS from you by then?

I am running a 12S, 6P configuration (maybe up to 8P).

I would like to mount the BMS on display in a billet machined box under a clear cover for display.

Matt

 

[geoff57]

Hi
Well my KFH is well on the way to recovery this is the result in just a week

this will not stop me using LiPo's but it will make me a lot more carefull in the future. keep things polorised, color code the connectors with electrical tape to get them put together in the right order, and most importantly NEVER work on a battery while under the influence of medication, presribed before you think I'm a junkie I'm only a junkie to E-bikes.

Geoff

 

[Hyena]

Still looks pretty sore Geoff!

I patiently await your KFF, KFH, KFD, and KFK (Kentucky Fried Kangaroo).
THEN we will see who the slow learner is

So far so good in my camp

 

[AussieJester]

^^ LMFAO ...very good Hyena

KiM

 

[graemebc]

Not selling? why stamp it with your name then huh huh huh?

 

[methods]

So far so good in my camp

That is awesome Hyena
We need more humor like that.

Not selling? why stamp it with your name then huh huh huh?

That is a good question. Why would a guy go to all the trouble and expense of designing a 36 channel BMS, fabricate expensive masked PCB's, populate them, and test them for 100 hours if he were not intending to do something with them. You will have to just wait and see


-methods

 

[graemebc]

oooo ( ®_® ) oooo

 

[geoff57]

Hi
Methods that is a good bit of kit you have there, guys he is not keeping it compleatly to hmself if you look in the battery technology section you will find the thread Methods has been working in (he comes in from page 4), it is only this latest 36 channel board that is secret.
you've done a lot of work there Methods, why did you not put a link in as to where the board came from.

Geoff

 

[methods]

Works out to equ. of $45 for 6S 5000mah
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6500

-methods

 

[recumbent]

Spoken to a friend today that shorted out one of these Flightmax-6S-25c battery packs, he was drawing 120 amps to an outrunner motor, powering his hanglider with a propeler settup.

I was thinking to possibly order 6ea, 6s-20C packs, but when i seen how poorly they were soldered together makes me wonder a bit. But that was 6months ago when he got them, maybe they got enough returns to motivate workers to fold-over the tabs and do it right.

Can anyone suggest the best Lipo battery to do the job, for my 60 volt bike?

 

[AussieJester]

Can anyone suggest the best Lipo battery to do the job, for my 60 volt bike?

I don't recall seeing any issues with the Turnigy 6s 5000mah packs..they are lil over 50 bucks a pop...

KiM

 

[swbluto]

I like the Zippy batteries, but despite the original $.43 per watt-hour calculation, with shipping, it came to $.56. Add on the shipping damage risk for a few members along with other encountered problems, I'm pretty hesitant to order from hobby-city, except possibly in large quantities consisting of smaller packs (So the risk is distributed). The next cheapest pre-shipping price was like $.46/watt-hour for smaller packs, though.

I was only thinking of getting lipo due to space constraints.

 

[graemebc]

Don't think he is keeping stuff to himself. Though he can if wants Just some good natured rib poking is all.

 

[GCinDC]

So w/ my DB25 setup, if anyone remembers, I've been accident free for a while (since p26, lol). (knock, knock)

Anyway, I'm trying to wrap my head around something regarding the paralleling of packs...

If two 5Ah packs are paralleled at the cell level, what happens if one goes low? Does the sister cell go higher to compensate? Or can one NOT go low - Do they both HAVE to stay at the same voltage? Can one die? Will it eventually just pull down a good one??

I have 8 x 5Ah packs total: 4 paralleled (10Ah) w/ two sets of cables, one to discharge @ 20s, another to charge @ 5s

So when I simply connect the charge cables (w/o charging), am I effectively balancing 8 cells (in parallel)?

Hyena, you mentioned something about this, didn't you?

If out on the road, one 10Ah pack goes super low, or didn't get charged beforehand, one can could plug in paralleling charge cables and it will 'ghetto' balance itself? And may get a touch hot...?