How to replace the internal clock battery

harveyf, here is a decent video on how to change the battery. Also, do not forget to look through the guides on here to learn a bit more about this model. Hope this helps, good luck.

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.

They can be found on ebay or Amazon; if you're paying more than $5 including shipping, you're being ripped off.

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.]