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Need a replacement 12v battery 2016 Volt, suggestions?

8903 Views 5 Replies 5 Participants Last post by  hellsop

Long story short I got stranded in my Volt several times over the past month. Pressing the start button would result in "Service Battery Charging System" requiring me to find someone who I could jump start the car using the front battery terminals.

It's been at the dealer now for three days, even having a traveling Volt specialist onsite to figure it out. End result... bad cell in the 12v battery. Problem is they won't replace it for me under warranty as I have 49k on the car, and they say the 12v battery is only covered by 36k 3yr.

Due to how the dealer had been handling the situation I chose to walk and replace the battery myself since it's not covered. The GM Tech told me to make sure I get a Fiberglass mat Battery and not a lead acid because the charging system in the volt can send upward of 16v and if I use a lead acid they could only handle around 14v before heating up and it could cause problems.

Does anyone have a suggestion where I can source the correct battery type for my 2016 Volt other then the dealer? Model # or anything?

I know there is this post --> but it's for 2011-2015's so not sure if the info is the same or not.
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Just a question is the AGM battery a starter battery or the deep discharge leisure type as used in RVs for house functions.

As I understand it the Volt does not need the high current to spin a starter, but may need the flatter output voltage curve of this type.
The Volt's 12V battery functions as a dual purpose, startup and cycling, battery. The startup load when powering on the Volt is not as large as when turning over an ICE engine. The Volt's 12V electronics use ~500W when powered on. The startup load on the Volt's 12V battery is ~ 40 amps. After a few seconds the Auxiliary Power Module (APM) takes over and powers the Volt's 12V electronics by drawing power from the high voltage traction battery for as long as the Volt is powered on. When the Volt is powered on I have observed the voltage supplied by the APM vary between 12.4V and 14.8V as measured at the accessory outlet.

The 12V battery also needs to be able to maintain the Volt when the vehicle is parked for up to 30 days while still being able to sporadically communicate vehicle status over the 4G LTE network. GM specified the Volt's 12V (BCI Group 47 AGM) battery so that the Volt can be parked for up to 30 days and still have enough reserve power to start up the Volt when the driver returns. Any replacement 12V battery needs to be an absorbent fiberglass mat (AGM) type lead-acid battery to be properly charged by the Volt's 12V APM circuitry.
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