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How do I change the backup battery?

Make sure you discharge yourself before messing around inside the computer case and ensure that the computer is off. In addition only attempt this if you are reasonably sure of what you are doing.

I accept no responsibility for any damage or injuries caused by following this advice, you use this at your own risk.

Your first step is to find it. Backup batteries come in many different forms, and may possibly be inside the clock chip and so will not even be visible! If you have an in-built battery the whole chip will have to be replaced, it may be best to consult a professional rather than attempt it yourself (unless you are a professional in which case why are you reading this?).

If you don't have a battery built in to the chip, then it should be quite obvious. Things that look like cordless telephone batteries, ordinary batteries or a big watch type battery (looks like a coin) etc. (a picture is worth a thousand words, I will put some here soon).

If you are unlucky the battery will be soldered in place, if so this is a job for someone who is experienced with a soldering iron, do not attempt it unless you are able to. If you do want to tackle it yourself then it's probably easiest to snip the leads off then solder the new battery to the old leads.

Before you replace the battery it's a good idea to test it with a volt meter to make sure that it is indeed dead. Obtaining a replacement may be difficult depending on the age of the machine in question. Surplus parts companies are a good source for older batteries, newer ones should be readily available.

A final note make sure that you consult the retailer first if in doubt about which battery to get, make sure that you get the correct voltage (and pinout if applicable).

Copyright © Jonathan Fox 2001.