NiCd battery replacement in vintage computers

dwight dkelvey at
Mon Feb 8 09:08:16 CST 2016

Make sure to neutralize the leaked alkaline stuff from the cells.
Just a simple cleaning isn't enough. I use white vinegar.

From: cctalk <cctalk-bounces at> on behalf of Maciej W. Rozycki <macro at>
Sent: Monday, February 8, 2016 6:55 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: NiCd battery replacement in vintage computers

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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