Trackpowers
 

Can anyone tell me why my 3600mah 30c stick battery are not holding there charge because my aren't?
They are charged at 4.5 to 5 amp and always balanced when chargering, I have had 3 balance go down on me but flighttech have always changed them.
Can anyone help?

need more info, what do you mean not holding there charge, how long can you run with them what are you running motor speedo etc and 4.5 / 5 amps is slightly high charge rate is 1c 3600x1c=3.6 amps

Well I charge them on 2 cell on the trackpower charger, and running them in a cat 3 mins you could see the power drop off and car not going as fast. And sometimes they stop because they hit the lipo cut off at 6 volts

how long are they being charged for?

35-45 mins

what motor? speedo?? 3mins does sound a little to quick to be at cut out voltage

Brushlless 6.5 and 5.5 and the volt cut off is 6v

does sound like a duff lipo, but can you get hold of another lipo to test of someone else,just to make sure,

I was always under the impression they should take about an hour to charge at 1C. I guess it's cutting off when it's peaked?

my charger charges the pack quite quickly to 8.4 volts and then the current comes down slowly while the pack stays at 8.4 although during this come down it probably puts another 800-1000mah into them

Sounds like they are worn out, they don't last forever you know. My oldest pack of 3600's have just started doing exactly what you explain.

Mine are way over 300 charges old so I am in no way disappointed with them.

how old are they? how long have you had them? were they new?
and its Trakpower with no C :p

:woot:you mean 1c mark lmao:woot:
sorry ill get my coat

hmm kind of reads not right with his problem :lol: lol

The original Trakpowers were actually rated for 2C charging, just they didn't really advertise it.

4.5-5A is around 1.4C, so is fine.

Tell you what i noticed with the tp's

They orignally advertised as the batts are good for 1000's of charges. they dont quote that anymore lol.

Col.

its true they are rated at 2c but doing so will reduce life span, so in this case, maybe its not ok, alo the brca guide line is 1c max.

the claim was allways 100+ for racing, and 200+ for practice, its still on the web site.......... One of my packs is near 200 now.

The BRCA are hardly at the forefront of technology with the '1C rule' then. At 2C, lifetime will be reduced, though not by that much.

I use (in 1/8) Hyperion batteries that are rated for 5C (and I've charged them at 3-4), and reports suggest that lifetime is not really reduced unless regularly charged at over 3C.

Trakpower did always say the 100 cycles in race conditions, 200+ in practice. Not 1000.

The "1C rule" is mearly a suggestion from the Electric Board. It isnt a rule.

Sorry, from Mark Christopher's post I gathered that it's a rule. I stand corrected!

no prob, my post does say guide line though, not rule.
Trakpowers darks have a 5c charge rate.

Although im struggling to find a charger than charges at 25A lol

mine only does 8A. the overloader not reallly living up to it's name lol

Even though mine say 2C in the book I'd rather stick to 1C to keep them at their best.

My charger will do 20A, and up to 8S. :thumbsup:

Still not 25A, but close...

With my new 1/8 set-up for next season, I'll have some nice Thunderpower 45C G4 cells, which are capable of 6C charges. They are only 1.75Ah, so 6C will be easy!

Well I have had them from new, and phoned and talked to flight tech and they told me how to charge them and I read the manual. And the batterys are 30c discharge. And they were charged on 2 cell because they told me to

Can`t you send them back too Trakpower? they might warranty them for you!

And the charging at 2C (2cell as you put it) has been explained in the replies and is fine.

Andy;)

i think you both may be getting confused, 2 cell is NOT 2c

tom how long have you had them and how many charges do you think they may have had?
when i have all the facts ill contact trakpower on your behalf as i work with them very closley

2 cell is right but you should for long life charge no more than 1 c which would be 1c so that would be 3.5 amps on your charger so you would set 2c (your charger then knows its 2 cells) and 3.5 (which would be amps)

:woot: I`m not confused but thought when he said 2cell he meant 2C

Hes obviously charging them above 1C and trakpower state 2C is acceptable but as you have stated could possibly cut the life span

Good luck

Andy :thumbsup:

Well the batterys are only 10-11 months old, and I have spoke to flighttech and I will be sending back to get tested to see what has happend to them. They are only used 2 times a month

you will probably get some new ones sent back

Fingers crossed :thumbsup:

ok if you have spoke to them, how many packs have done this? when your not using them, how do you store them? (meaning with how much in them?)
when you say twice a month, it that 2 runs or two race meetings?

You'd set the charger to 7.4V, or 2S (2 cells, in series) Lipo, at 3.6A for 1C (take capacity, divide by 1000, and you have 1C). 7.2A for 2C. 5A is 1.38C, so is well within limits and should barely reduce life cycle.

but it is fact that charging them over 1c reduces life span,
2c is given that there safe to take a charge rate of that, at detriment to life span.

I dare say 11 months and charged at 1.4c you have had your monies worth