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Old Jan 18, 2008, 09:51 PM
rnorth is offline
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How often do you balance lipos?


I have a quick question that I'm sure has already been asked. When charging a lipo battery, how often do you put a balancer on it while charging?
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Old Jan 18, 2008, 10:29 PM
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Why not just leave it connected?
Old Jan 18, 2008, 10:41 PM
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I use an FMA 4S. The battery is balanced every time I charge it.

Joe
Old Jan 18, 2008, 10:44 PM
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Quote:
Originally Posted by everydayflyer
Why not just leave it connected?
I mean how often do you charge a lipo battery with the balancer on it. I have read where you need to balance the cells every time you charge and others say every 5 or 6 times.
Old Jan 18, 2008, 10:50 PM
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I have read where you need to balance the cells every time you charge and others say every 5 or 6 times.
True you will read both of these statements.
Truth is it depends on the LiPoly and how you care for it or abuse it. Top quality LiPolys which are not abused rarely need balancing. Most cheap LiPolys need balancing every charge. Any LiPoly that is abused needs balancing every charge.


Charles
Old Jan 18, 2008, 10:51 PM
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Quote:
Originally Posted by Joe Minton
I use an FMA 4S. The battery is balanced every time I charge it.

Joe
Joe, this is what I do. I use a blinky balancer on my lipos every time I charge them.

Richard
Old Jan 18, 2008, 11:01 PM
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Quote:
Originally Posted by everydayflyer
True you will read both of these statements.
Truth is it depends on the LiPoly and how you care for it or abuse it. Top quality LiPolys which are not abused rarely need balancing. Most cheap LiPolys need balancing every charge. Any LiPoly that is abused needs balancing every charge.


Charles
Charles,
Thanks for your input. I guess for me the safe thing to do is balance everytime. I guess my main reason for asking this is to fine out if there is anything negative about balancing every time? Or is it good to give the lipos a break from balancing every once in a while?

Richard
Last edited by rnorth; Jan 18, 2008 at 11:06 PM.
Old Jan 18, 2008, 11:18 PM
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Quote:
Originally Posted by rnorth
Charles,
... Is it good to give the lipos a break from balancing every once in a while?

Richard
It is easier on the batteries to balance them, so, just like a girlfriend or wife, having them in balance is a good thing.
Old Jan 18, 2008, 11:23 PM
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Quote:
Originally Posted by Time Pilot
It is easier on the batteries to balance them, so, just like a girlfriend or wife, having them in balance is a good thing.
Good luck finding one of THOSE that's balanced.
Old Jan 19, 2008, 02:18 AM
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OK, I'll be the outlaw.

A couple of small 2S 1200 mAh packs have never been balanced in well over a year. They have taps, and are checked infrequently - they are fine.

My larger packs, 5S and 6S, have the original Tanic Packs JST taps - a bit of a pain to connect to. If needed, they are balanced, but that is not very often.

Bill
Old Jan 19, 2008, 06:06 AM
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I use the e-Station BC-8 with built in balancer, balance every charge. No reason not to.
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Old Jan 19, 2008, 06:28 AM
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Like everydayflyer says, depends on the battery and how it has been used. If you are lucky and get perfectly matched cells, balancing is often not needed. however, if there is even a minor difference in the cells capacity, it is best to always balance else the lower capacity cells will become overcharged and could cause a big problem.
Old Jan 19, 2008, 07:12 AM
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I understand more than 0.03v different indicates a need for balancing.
About balancers, the ones I see, discharge the cell to balance it with the others. That would seem to be adding to the number of discharge cycles. All that time balancing would also be discharging. Add up 100 cycles of balancing and how many full cycles did it equal ?
Based on all I have studied, the accurate individual cell charger would a better bet. That may increase cell life by independantly charging the cells to balance. Not by discharging them. If one can't be charged equally, something may be wrong with the pack.
I mean the type that charges all cells simultaneously.

EDIT :

An afterthought is the balancers may only discharge in a range from 1/4 to 1/2 C or so, an approximation. At .5C I understand the number of cycles increases to the thousands, so the discharging balancer probably does not have much effect on cell life.

Ch
Last edited by Chophop; Jan 19, 2008 at 08:01 AM.
Old Jan 19, 2008, 07:31 AM
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I balance EVERY charge.

How hard is it to do? And are you willing to accept the consequences of not balancing (possibly burning down your house or shop)?
Old Jan 19, 2008, 08:06 AM
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If they are that dangerous, then maybe a cell overvoltage alarm should be connected during charging. It should make a loud audible alarm if any cell goes over voltage and maybe a thermal alarm also. Well, probably throw in an expansion detector too.
I can supply DIY info on those, if I tried to sell them, I'd be swamped with competitors anyway.

CH


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