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-   -   Charger capacity read-out, affected by IR?? (https://www.rctech.net/forum/electric-road/44947-charger-capacity-read-out-affected-ir.html)

s2 07-12-2004 03:35 PM

Charger capacity read-out, affected by IR??
 
if chargers work out the capacity in a pack using a mathmatical equation (the dont actually count the individual MaH's going in) so does this mean a cell with a lower internal resistance will charge faster, and therefore apperar to have slightly less capacity? or am i totally wrong and IR only is a factor upon discahrge in race conditions?

cheers

Stew

David Root 07-13-2004 03:28 AM

As far as I know IR doesn't come into play until loads get higher than C. Charging should not matter. Higher IR will make the batteries peak at a higher voltage or that is an indicator, but does not change the capacity of the battery.

Our batteries are rated at C or 1 times the capacity. That would be 3300 Ma for one hour. We use that in 5 minutes or a little more. Lower IR lets the power out of the battery.

High IR would let you have 3.3 amps for 60 minutes, Low IR lets us have 33 amps for 6 minutes.

Charaging rate is C or as high as 2C (6.6) amps, so IR should have little effect.


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