Pictured is the original 1/2 AA Lithum battery dated 1/8/1987. The voltage measured from the terminals was nearly 0. Although the battery was not leaking yet, eventually it will leak and if left unchecked ruin the motherboard. So I snipped it off, leaving the posts still attached and folded out of the way. Click image to view larger version of image.
Snip, battery removed. If I used this computer a lot I might put in a new battery, but it's not necessary to have it for anything I need. One could attach clamp-end wires to the snipped posts and on the other end install a battery holder so that a fresh battery can be installed as needed. Or I could remove the board and solder in a new battery. It's best if you ask me to remove the battery and be done with it (similar to the Amiga 2000 et.al.) Click image to view larger version of image.
I have been systematically going through all computers that have batteries to replace or remove them.
Side story. I got this computer in the early 2000's for $5. As you can see, it looks like it was never used. The insides is almost entirely dust-free. The system came with a single word processing disk containing a diary. It appears the original owner bought the computer, started a diary and quit after a few days never to use the machine again.