NiMH batteries will increase in temperature while charging. BUT my batts get reasonably warm with a clever charger, before it finishes. Is it worth mentioning that they WILL get warm once fully charged, and left on charge, as the excess charge is turned to heat? Does not apply to clever auto charges of course. I charge mine overnight at C/10 and they barely get warm. For example, four 2200maH NiMH AA cells will last all day so there should be no need to fast-charge them. Not a lot of room for standard equipment, let alone for additional cooling.Īs Mike says, keep charging current below 'C' rate and you'll have no problems. So check the charge rate first ,secondly I do not charge batteries near water ,they do not mix.Ī final thought why not use a fan to help reduce heat, a pp9 and a simple rig should suffice ,save on buying extra batteries and use a used battery to drive a fan Good luck Michael Hi John From experience batteries mostly get hot when charged at a high rate of charge When racing we would charge at about 5 amps (they would then get hot but when charged at 2 amps warm but never hot. If they are, then to be safe, you could insert a sheet of 3mm balsa to insulate the batteries from the hull. Should be OK as long as they are not in direct contact with the hull.
Is it okay to charge NiMh batteries in situ in styrene hulled models such as the Model Sipways Puffer, or ought they to be removed? I'm concerned as the cells get rather warm when charging.
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