How to replace the internal clock battery
How to replace the internal clock battery ?
BTW, you might want to know before you open the case that the battery you are replacing is labeled "ML1220/2E2E0X", which is a small watch-style cmos button battery soldered to a wire pigtail, so it's ready to plug in.
Another option is un-solder the original, find a generic ML1220 battery, and then solder the old pigtail connector to it, using shrink-wrap tubing to seal things back up.
[This battery is probably identical to the very common CR1220, both being 3V lithium button batteries. Dunno. Switch to a different model if you don't mind the uncertainty and risk.]
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