Risc PC CMOS Battery
Revised: 12 Jan 2019 - Design and Content © Bernard Veasey 1996-2022 - All rights reserved.
Risc PC, A7000 and A7000+ CMOS rechargeable battery replacement
NiCad AAA Rechargeable Battery - 300mAh
Battery holder with spacers and cables attached
Battery holder fixed inside Risc PC case
Due to the original type of CMOS battery no longer
being manufactured and only a few retailers selling
residual stock, I have tried the following battery
replacement which works well for me and is cheap
to install.
AAA battery and holder wired in to the Risc PC (left) and A7000+ (right)
motherboard where the original battery has been removed.
Positive and negative CMOS battery power cables soldered into
the (A7000+) motherboard
Parts required
•
GP30AAAKC NiCad AAA Rechargeable Battery -
300mAh - 1.2 volt - Cost: £1.16
•
I am also told the following Ni-MH batteries would be
fine:
o
BT05627 Ni-MH Rechargeable Battery -
700mAh - 1.2 volt - Cost: £2.51 - Web
o
BT06314 Ni-MH Rechargeable Battery -
650mAh - 1.2 volt - Cost: £1.46 - Web
•
BX0034 Battery Holder - 1x AAA - Cost: £1.42 - Web
•
Cable, sleeving and 2x Spacers with screws - Cost:
£0.14
Charging
I understand that the time needed to initially
fully charge a drained 600mAh cell in a
Risc PC would be 75+ hours.
This battery arrangement works fine for me but I cannot be held
responsible for any problems you might have with it.
Cost of the above was what it cost when I looked up the price!
Wiring Diagram
Download wiring diagram as a Draw file.
