Hi, i have a NIMH battery pack thats 28.8 volts and im charging it with a 25.2 volt charger. will this damage the batteries?
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:) Your 28.8 pack has 24 cells in series , when charging each cell should have at least 1.5 volts available ( current limited of course ) just doing the math 24 X 1.5 = 36 volts .You should use a 36 volts charger with enough current capabality to recharge the pack in a couple hours at most , have found that charging NIMH at anything slower that C/2 make it very difficult to determine the the end of charge .
Charging at less than C/10 is possible if the state of charge is now .NIMH are not easy cells to recharge without some overcharging .
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unplug the charger from the batteries, and measure its open circuit voltage. If the existing charger comes up high enough in voltage, than you may not need a new charger. But because the charger current will taper off when the voltage comes up, then it may take a very long time to charge the pack to 100%. You might want to measure the charging current throughout the charge cycle.
http://www.powerstream.com "Technical resources" - "How to Charge NiMH Batteries"
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