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C7 Corvette, H3X Hummer
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These are most likely AGM, which are supposed to have very little vampire drain, unlike lead acid. My Bolt and Mach E both have AGM batteries, and I put a deep cycle AGM on my boat.

If you go to other EV forums, like Mach E or Rivian, the same battery issue seems to occur often on those as well. Not only that, but then because of the PAAK (phone as a key) feature, people also complain that the car apps cause the phone batteries to drain too fast. The phone and the vehicle are always trying to pick up a Bluetooth connection.
When does this 12v battery get charged? Combustion cars have Bluetooth, WiFI, Apps and remote start with both key fob and iPhone. My battery in my corvette lasted 5 years. Not buying it.
 

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C7 Corvette, H3X Hummer
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177 Posts
Also, these vehicles are "connected" (4G/LTE or Wifi) and looking for OTA updates as well. The 12V should be charged when the vehicle is plugged in to an L2 charger and while driving. But when they sit at dealers for a while, they are likely not always plugged in. Also the 12V batteries in EVs are not used to crank the engine, so they are lower power batteries to begin with.
So for those who are EV owners, what is the life expectancy of these accessory batteries?
 
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