Hi,
I am in the process of qualifying a product the uses a nickel metal hydride
(N-MH) battery. It is shrink wrapped and appears to be four AA cells in
series. the rating is 4.8 volts, 1100 mAh.
My standard requires a fault analyses of the charging circuit. As I have had
no experience with N-MH batteries I can only guess what the expected outcome
will be when overcharged. The faulted charging circuit could be either 6.5
volts at 2 amps, or 9 volts at 1 amp.
I have only one sample to test so I can't afford to make a mistake.
What will I expect to see?
Does the N-MH battery come with a built in vent?
If so, does the vent release toxic, flammable, or any other hazard?
Is there a chance of explosion?
There appears to be a fuse under the shrink wrap. Is it to prevent high
current in the event of a short? Our could it be a thermal device to prevent
overcharging?
Any other hints or advice?
Ron Duffy
Agilent Technologies
Colorado Springs Division.
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