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International Automotive Technicians Network
Re: EV 12V battery replacement
Posted to Technical Discussion Forum on 6/1/2023

If you want reliability, replace the 12V as it's bad.

BUT, "it depends". On many EVs and hybrids, the 12V supplies only enough power to boot the computers up. So it's not unusual to see a Prius "starting just fine" with a 7-8 year old 12V battery. Until it c... Login to read more.