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› Balancing by charging one at a time
10-09-2005 09:27 PM  12 years agoPost 1
raptorbasher

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Bristol, England

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Hi guys,

As I am a tight arse, and not wanting the spend money on a balancer,
can anyone tell me if its okay to charge each cell separately in a pack to get them all the same?

as long as the same charger is used on the same settings it should work as far as I can see, ie all at the same termination voltage.

any reasons as to not do this once in a while???

thanks

Tim

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10-10-2005 06:09 AM  12 years agoPost 2
Rob_T

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Nothing wrong with trying to save a few pennies...

In this case it's perfectly OK. At least one battery manufacturer (Tanic) actually provides a special charging lead specifically for balancing this way.

Just make sure you set the charger to 1 cell before starting otherwise things might turn nasty!

Unless the battery is a long way out of balance, you can save yourself some time by first charging the battery to about 90% using your normal series charging method, and then just finish off charging 1 cell at a time to balance. (90% charge is about the point where the charger starts to reduce the current if you're charging at 1C rate, so if your charger has a display of the charging current just watch that for when the current first starts to drop).

PS dont be tempted to try and speed this up using multiple chargers. There's a danger of shorting cells through "sneak paths" through power supplies!

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10-10-2005 08:07 AM  12 years agoPost 3
tean

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Gloucestershire,UK

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The Schulze website,
http://www.schulze-elektronik-gmbh.de/index_uk.htm
seems to positively recommend this method of balancing. It seems to cast doubt on the usual "limiter" method. Look in the tips section under Lipo maintainance.

.

Logo14 Vbar, Logo500 CSM flybarless, Trex 600 CSM flybarless, 3DMP, Logo10, Lipoly, Mini T, .......

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10-10-2005 09:05 AM  12 years agoPost 4
raptorbasher

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Bristol, England

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Thanks Guys,

I thought it would be a reasonable way to do the same job as the balancer circuits, but tis best to ask.

for how often I actually use my packs, and that probably balance only every ten or so cycles, it was hard to justify the cost of purpose made units.

Just fitted taps to my older kokam packs, and even without balancing they are pretty much spot on anyway, so I have been lucky so far.

Cheers

Tim

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10-10-2005 09:10 AM  12 years agoPost 5
Rob_T

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That's an interesting article.

I wonder how much the fact that Schulze charge to above 4.2V per cell and balancers seem to be set for exactly 4.2V per cell influenced the conclusion?

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