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Old 07-30-2010, 06:11 AM   #1
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Exclamation Lipo batt balance question?

What is the maximun volt difference tha I can safetly have beetwin cell in a 4cell batt pack. For example.
4.18 4.19 4.19 4.20 is it good?
4.16 4.18 4.18 4.20 etc, etc, etc. Or does it have to be exactle 4.2 4.2 4.2 4.2?
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Old 07-30-2010, 08:20 AM   #2
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In for an answer...
China Lipos
China Speedos
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You aint messin wit my dougie..
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Old 07-30-2010, 08:26 AM   #3
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I remember reading somewhere that 0.05v difference is acceptable. That's what I use as a gauge. Not sure if it's true or not...but it sounds good.
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Old 07-30-2010, 09:06 AM   #4
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Most balancers have a 0.02V tolerance. A bit more than this is fine under most circumstances, but can be dangerous in the wrong hands.

For instance, a 2 cell pack that balances to within 0.05V: While charging you might see 4.15V, 4.20V at full. Not a problem if your charger reads individual cell voltage, but for a non-balance type charger, all it knows is that the voltage is 8.35V and it will continue charging both cells. Overcharging is very dangerous and I think balancers should always be used.

When discharging, ESCs dont have individual cell checkers, so its a similar situation to a charger without balancer. If you are set to a 3.0V/cell cutoff, or 6V cutoff for a 2 cell, and then one cell is at 3.05V, this means the cutoff will not kick in until the other cell is at 2.95V. Not usually a fire hazard, but not good for the cells at all.
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