NiCd battery replacement in vintage computers

Maciej W. Rozycki macro at
Mon Feb 8 08:55:33 CST 2016

On Sat, 6 Feb 2016, Chuck Guzis wrote:

> You're talking about RTC and perhaps a bit of static RAM maintenance. If this
> RTC unit is like most of the same era, the operating voltage range is quite
> wide (probably about 2-7V) and sub-1ma current draw. Chargers for this type of
> application are usually very low current, so "cooking' some AA cells is a very
> remote prospect.  This is hardly a power-hungry project.

 As a matter of interest I've checked the MC146818 datasheet and it claims 
a 50µA current draw in the usual configuration with a 32768Hz oscillator.


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