Dreamcast Battery Backup Mod
0 NICESposted by Iain Metcalf
from Durham United Kingdom
on November 17, 2016
I got sick of having to enter the time and date every time I powered up the machine so started looking for a solution. The button cell is quite hard to find with the correct connectors, 2 pins on the positive and one on the negative.
After digging about the net I found a guide on how to replace the original battery with AAA batteries (linked).
Must admit is wasn't overly hard to actually do.
Parts list :
AAA Rechargeable Batteries rated 750 mAh
I had problems actually desoldering the original battery from the board, I think the mount was absorbing to much of the heat and stopping the solder from melting. So I had to carefully clip close to the circuit board to get the battery free. I then soldered small blobs onto the protruding bits of the legs (no bigger than what you normally see on a board).
I did forget to actually get the correct single core electronics wire but our local Wilko has wire of all types so i bought a meter of 3 core copper house wiring with 750 mAh and 240v spec. I dressed the end of the wiring after twisting it and good to go.
Soldered it onto the board ready to attach the battery box. Looking at the battery box the batteries go in what is know as series, this is essentially top to bottom going in a straight line. So the negative goes where the spring is and positive on the other.
I again struggled with soldering the battery box as the plastic is pretty cheap and heated up quickly so you have to be careful, thankfully no major damage but I may buy a better quality part later down the line and replace it.
Popped the AAA batteries in and done the test and I now have battery backup for date and time again on my DC. Another great thing with this small mod is that when the batteries are no good in the future they are easily replaced.