In message , David J
writes
Looking at replacing the AAA NiAh rechargable batteries in a Binatone
phone. They seem to have lost some of the original capacity when used
during calls.

Originally supplied with 2 off 1.2v 650 mAh.

What is the significance of the last value? Could a 1000mAh be used
instead. Would that increase the 'storage' period?

Current is measured in Amps and milliamps. A cell with a capacity of 650
mAH would in theory deliver 650mA for one hour then go flat, or perhaps
325mA for two hours. Your 1000mA cell has about a third more storage
capacity than the old ones and so should in theory last a third longer.

In practise the time between charges is also dependent on the cells'
self-discharge rate. But you can safely use 1000mA cells and should
expect to be able to use the phone for longer between charges.



--
Bernard Peek