Motor Vehicle Maintenance & Repair Asked on February 22, 2021
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?
Yes, this is a bad battery. One of the cells has most likely shorted. Each cell is a little above 2vdc. A fully charged battery will usually be ~13vdc. If you lose one cell, it will drop it down ~2vdc, which puts it right down in the arena of 10.5vdc. A direct short inside of a cell will allow electrons to pass through the short instead of raising the voltage, which is the reason you're still reading the 10.5vdc. Anyway, long story short: you need to replace your battery.
Correct answer by Pᴀᴜʟsᴛᴇʀ2 on February 22, 2021
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