Quote:
Originally Posted by emeritus
'...I must have got through dozens of sets of 6 blue U2 batteries throughout the 1960's to power my EL3585 tape recorder, and never had a single one leak, despite regularly subjecting them to "recharging" by being connected in parallel with a very basic 9V DC mains unit that dad built from a PW article (bell transformer, one silicon diode, one zener, and one electrolytic capacitor).'
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I seem to remember that it was possible to recharge zinc-carbon batteries partially with 'dirty d.c.' although I can't remember any of the parameters for doing so. I remember trying it with U2 torch cells and it sort of worked - sometimes - and sometimes not...