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Old Jul 1, 2007, 5:48 AM   #1
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I've 3 sets of NiMH batteries (all uniross):

Set 1 - 4 x 2300 mAh (5 years old)
Set 2 - 4 x 2500 mAh (3 years old)
Set 3 - 4 x 2700 mAh (2 years old)

I've noticed recently that sets 2 & 3 hardly last anytime in the camera even after a new charge. Whereas Set1 the oldest set give good life.

I've tried numerous charge/recondition cycles on the charger on sets 2 & 3, but they don't seem to improve.

when newly charged Sets 2 & 3 measure about 1.4V, but after one day not being used they measure 1.3V and after a few days are down to around 1V.

Set 1 seems much more stable and even after a couple of weeks still hold a charge of >1.3V.

So are my batteries faulty? If so why has this happened?

Set 1 have had far more use that the other two, yet thay are still going strong.
The batteries don't get heavy use, mainly on vacations etc over about 5/6 weeks of the year, could this be the problem, when they are left unused for periods of time?
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Old Jul 4, 2007, 2:32 AM   #2
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Hello Hammer,

There are know issues with the 2500 mAh cells. They seem to develop higher rates of self discharge after they have been used for awhile.

I am not sure what is going on with your 2700 mAh cells. Higher capacity cells seem to have a higher self discharge rate, but I have not seen it as being drastic.

It appears that your fault is that you used your cells...:-)

If you never used them, they would probably still be OK...

Tom
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