A few days ago, my 97 Corolla had trouble starting. It cranks but doesn't start, maybe due to a problem with the carburetor. Figured I might discharge the battery, so I stopped my attempts at starting. Fast forward to this morning, I tried to start the car, but it had difficulty cranking, it was barely able to spin the pulley and was making a clicking noise. I measured and it was 10.5V.
I went to charge it with a 10 amp 12 v charger for like 8 hrs. I took a reading immediately after charging and it read 12.9V
I let the battery rest down, unconnected to the car, for 3 hours and when I checked, the voltage was back down to 10.5!
Is my battery busted? Should I try charging it for a longer time?