I have a 3 3/8" cordless circular saw. I've had it a few years, rarely
use it, but it does come in handy from time to time. I have three
batteries, all too weak to be any good and I can't find any new
batteries.

The saw model is 2977 and the battery model is 92927.

When I do an advanced Google, including model numbers, in the "must
have" field, I get hits but when I go to the pages there is no sign of
the battery.

On the one hand, I hate to throw away a perfectly good tool for lack
of a battery. On the other hand, I will probably find that a new
battery costs more than a new saw, and I already have a cordless Black
& Decker so wouldn't go that route.

Suggestions?