this post was submitted on 18 Dec 2025
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You can replace the battery while the game is running to preserve the save. Need to have a few customized pieces though.
That sounds sketch asf. Just dump the save file with a flasher. That RAM chip is writeable from the cart pins or it wouldn't work as save data. Cheap flashers come in at ~$25. Dump, solder, reupload.
Why? The battery is just a current, and while the gameboy is on, it’s supplying the current instead.
What you’re suggesting is far more work and steps, and any transfer can corrupt.
There’s no way this can go wrong unless you turn the power off or disconnect the cartridges pins from the mount. Which can happen while using the transfers as well….
You don’t even need a computer, just the cart and a gameboy, and a screwdriver. It’s funny what people think is easier while including a dozen unnecessary extra steps that introduce issues at each step. And costs money.
IIRC from various board schematics at a previous job, typically you have the battery connected into the relevant voltage supply with a diode. So when that Vcc line for your memory module or real time clock is powered externally, the battery just sits idle since there's no voltage drop across the diode to get current flowing from the battery.
It works well because it's analog and fast and solid state. And yeah as long as you don't bump other parts or break something, if you swapped the battery on a powered system it should be fine.