In article ,
Bobby wrote:
I'd recommend 12V minimum, more for cheap brands, as their volts
aren't as good as brand names.

What difference does the voltage make?

Because the cells are all standard sizes they have a maximum capacity in
amp hours. Increase the voltage and everything else being equal, the amps
drop so the battery lasts longer.

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*Procrastinate now

Dave Plowman London SW 12
RIP Acorn