Quote:
Originally Posted by Edd
hi guys,
yes another battery gone down . i use a x-15 computerized charger and nimh much more 4800 mah 7.2v saddlepack batteries and like usual i charged it up today and then i hear a big bang, i go up the plastic container has a whole in it (fire proof) and the cap of one of my cells has fallen off or exploded off, i hear a humming noise in the battery.
my settings for charging is usually 5.0 amps and has been for the past 2 months however i thought i saw on the charger "8.62v" and i thought that was quite strange, so is that my problem?
sorry it sounds abrupt.
Edd
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Can you tell me a bit more about this X-15 charger? I have never heard of it.
8.62 is not an unusual voltage under charge, NiMH's will generally peak at over 9V.
Assuming no charger fault there are two main reasons why NiMH cells fail under charge. One is dodgy soldering and assembly which has blocked the vent holes. The other is that one of the cells has self-discharged more than the others, so gets overcharged and fails. This is why it is good practice to equalise cells before charging, at the very least check each one with a voltmeter to see that they are all about the same.