Abandoned_Trolley wrote:

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Out of interest, you may like to note that I have a couple of Uniross
NiCD PP3 cells, which must be at least 10 years old, but seem to still
work ok - the downside is that the capacity is only 120mAH, but thats
enough for a few hours service on wireless microphone system.


** The only common application for 9V batts I know of which has both high discharge ( ie 50mA) AND regular use is a radio mic.
I doubt the OP has any of them.....

What else are are high capacity , rechargeable 9V batts good for?

The self discharge rate ruins them for most jobs.


...... Phil