I purchased a CPO 2017 REx in 2019 and think there might be something going on with the 12v, but dealership says not covered under warranty?
Is there a difference in how i3s utilize this battery verses how ICE vehicles use their battery? Why are some dealers replacing these 12v batteries under warranty, but my dealer is not?
The CPO warranty doesn't cover as much as the factory warranty - and the 12v battery is considered a 'wear' item, not covered. Some dealers will replace them 'good will', most won't.
The 12v battery in the i3 is an Auxiliary battery. Unlike a12v starter battery in ICE cars designed to give a quick burst of power to turn over the engine, the AUX 12v is a deep-cycle battery there to power up the computer systems and electronics when you turn the car on, before switching to the DC/DC converter that draws power from the HV battery pack, and to provide power to the car's sensors, like the alarm sensors, comfort access sensors, etc. Like all batteries, they eventually age and fail. Some report them failing after three to four years, some have them last six or more.
Easy enough to replace the battery yourself - several YouTube videos show how. The OEM battery is manufactured by East Penn manufacturing, and they sell it as their AUX 18L, under both the Deka and Remy brand name. The Remy you can buy online https://www.remybattery.com/start-stop- ... ttery.html
, the Deka you can pick up at any regional East Penn distribution warehouse. You can search for them here: https://www.eastpennmanufacturing.com/c ... re-to-buy/
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE