NiCd battery replacement in vintage computers

[Chuck Guzis]

On 02/06/2016 05:05 PM, Lyndon Nerenberg wrote:

> Voltage?  Recharging circuits?  Current sinking capacity.  It's not
> always a 1:1 mapping.
>

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.

If you're not interested in a "authentic" look, a plain old lithium 
primary coin cell or two, with a blocking diode in this circuit should 
work for years.

--Chuck