Join Date: Aug 2013
Location: Ocean Isle Beach, NC
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Replace 12v battery routinely?
On my ICE cars I have never replaced a battery until it started having symptoms. Sometimes I'd go 10+ years with the same battery.
But do I need to change my thinking with the 12v battery in the EV's? We've got a couple of threads going now where leaving a dead 12v battery in the car might "brick" the HV battery and even though the HV battery might still be functional, there is no way anyone has come up with yet to put it back in service.
The 12v batteries on my two Smarts are each about five years old and reading 12.7v. I think they are both the originals, but here is an interesting note in the service record I got from the dealer before I bought the coupe.
"Radio left on by sales. Battery drained and had to be charged. Okay after charge."
Apparently that situation had no bearing on the HV battery.
2014 EV Coupe 18,000 miles
2014 EV Cabriolet 12,000 miles