2014 MacBook Pro new battery unavailable
I bought a new 2014 MacBook Pro in December, 2014 and it has been a great device, however, the battery is winding down. It will still work when unplugged but I noticed the screen does brighten up when I plug it back into an outlet. It meets my modest needs but of course I'm no gamer. I checked the list of available replacement batteries from Apple and none is listed for my 10+ year old MacBook. I just bought a new MacBook, but can I still use the old one as a spare if I keep it plugged into an outlet going forward or will it eventually quit working completely when the battery dies?
MacBook Pro 13″, macOS 12.7