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T-REX 450 › New FP EVO 25 2170 3S imbalance
08-12-2007 05:35 AM  10 years agoPost 1
zsultan

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USA

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I recently bought 2 FP EVo 25 2170s and flew them for the first time today. I found that both the batteries are imbalanced and when i charged them today with hobbico elite charger they were charged to 12.633V, i have 3 more similar FPs and those were perfectly balanced from day one.

Is it normal to be imbalanced or is it something wrong with these FP lipos?

Thansk

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08-12-2007 06:50 AM  10 years agoPost 2
menace

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Sydney, Australia

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u really need the FP 'V' balancer,

you could try to charge each cell individually after the normal charge to bring each cell to the same voltage, but ur gonna have to make a special connection and make sure if ur gonna do that, to charge each cell at 3.7v

!boo!

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08-12-2007 06:55 AM  10 years agoPost 3
zsultan

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USA

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I balanced the lipos with ThunderPOwer 205 balancer. Is it normal for brand new battery to be imbalanced?

Thanks

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08-12-2007 10:40 AM  10 years agoPost 4
menace

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Sydney, Australia

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the worst i had on the FP was 4.20,4.11,4.02 before i done my balancing rig but now i got FP 'V' balancers and i have checked them after they have been charged on the 'V' balancer and all 3 cells were 4.20v

!boo!

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08-12-2007 11:04 AM  10 years agoPost 5
zsultan

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USA

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is the V balancer better than TP 205? or is it ok to balance with TP balancer?

Thanks

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08-12-2007 11:12 AM  10 years agoPost 6
menace

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Sydney, Australia

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should be fine as long as you check each cell individually with a multimeter

but FP recommends the 'V' balancer for pretty much hands off charging

!boo!

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08-12-2007 11:14 AM  10 years agoPost 7
zsultan

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USA

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How do you check individual cell voltage?

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08-12-2007 11:23 AM  10 years agoPost 8
menace

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Sydney, Australia

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you place the negative multimeter lead on the negative and the positive on the one next to it and it should read between 3v&4.2v
then shift to the next as the + of the first cell becomes the - of the middle one and so on

its a bit hard to explain and i dont have a pic to properly show you, but i will try a pic soon

!boo!

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08-12-2007 08:05 PM  10 years agoPost 9
robhurlin

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Pretoria, South​Africa

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I bought a new FP 2170 25C the other day. I put it straight onto the FP V balancer and it was perfect out of the box. I have run a few cycles now and always charge with the V balancer in the circuit - no problems so far. I bought an extra lead for it which I am goint to cut through and connect to a terminal block so that I can safely measure each cells voltage. Measuring them off the pins is a bit risky, its easy to short the pins out = sparks and smoke!

Rob.

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08-12-2007 08:12 PM  10 years agoPost 10
zsultan

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USA

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Is it ok to have imbalance in the new Lipo? or do i need to call warranty ?

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08-12-2007 09:27 PM  10 years agoPost 11
dct

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San Angelo TX.

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First!
A Battery being out of balance is sometimes caused by over discharging them when new? Brake them in easy for 6 to 10 packs.
Next did you check them before you charged them up for the first time? They will not warranty them for just being out of balance unless you can't get them to balance using a charger with balancer when charging ever. How far off of balance are they? Read each cell with a good digital volt meter . Also, your balancer can go bad. I have had more then one do it. And I have tested more then one setup and NONE OF THEM WILL BE PERFECT!

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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08-13-2007 05:29 AM  10 years agoPost 12
zsultan

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USA

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dct,

I was able to balance the cells with TP 205 balancer, my question is if they are imbalanced when new, does it create any problems in the future?

BTW, i am braking in the battery by discharging 50% for 5 cycles.

Thanks

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08-13-2007 10:45 PM  10 years agoPost 13
zsultan

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USA

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Does any one noticed brand new FP lipos imbalanced??

Thanks

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08-14-2007 12:23 AM  10 years agoPost 14
dct

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San Angelo TX.

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I don't own FP batteries, but I do own TP and they can be out of blance a little. I don't know how much we are talking about?And if you didn't check them before you charged them . Who knows how off they were?
I would say if they are close there fine. It seems like you are worried about it. So I would just ask FP in a e-mail.
I know most batteries will drain one cell it seems more then others.And I have owned about 12 batteries so far. It seems to me on my setup, it the center cell that gets more taken out of it.

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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08-14-2007 12:51 AM  10 years agoPost 15
zsultan

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USA

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Thanks DCT

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T-REX 450 › New FP EVO 25 2170 3S imbalance
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