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You should be able to get it replaced at an independent shop for under $300. I bought an OEM replacement battery from my local East Penn Manufacturing distribution warehouse. East Penn makes the i3 OEM 12v battery (AUX 18 L), which they sell under both the Deka and Remy brand name. The Remy is available mail-order. At the East Penn warehouse here, I think the price was around $123, and my independent BMW mechanic quoted $150 to both install and register the battery. Many owners do it themselves. A little more complicated than the standard ICE battery, but do-able. There are several YouTube videos on how-to. Registration takes an ODB tool and BMW software that supports battery registration, like Bimmerlink. East Penn has distribution warehouses all over - you can do a search for ones local to you on their web site. https://www.eastpennmanufacturing.com/contact/where-to-buy/And no, getting an indy garage to swap out the battery, or doing it yourself, does not void your warranty. The Magnuson-Moss Warranty Act legally prohibits the car manufacturers from voiding your warranty if you do your own routine maintenance outside the dealership - just save your receipts as proof.Have you asked your dealer if they cover the battery under the CPO warranty? The fine print in the CPO says no, but I have heard of people with CPO warranties getting the 12v replaced for free by their dealer.
You should be able to get it replaced at an independent shop for under $300. I bought an OEM replacement battery from my local East Penn Manufacturing distribution warehouse. East Penn makes the i3 OEM 12v battery (AUX 18 L), which they sell under both the Deka and Remy brand name. The Remy is available mail-order. At the East Penn warehouse here, I think the price was around $123, and my independent BMW mechanic quoted $150 to both install and register the battery. Many owners do it themselves. A little more complicated than the standard ICE battery, but do-able. There are several YouTube videos on how-to. Registration takes an ODB tool and BMW software that supports battery registration, like Bimmerlink. East Penn has distribution warehouses all over - you can do a search for ones local to you on their web site. https://www.eastpennmanufacturing.com/contact/where-to-buy/
And no, getting an indy garage to swap out the battery, or doing it yourself, does not void your warranty. The Magnuson-Moss Warranty Act legally prohibits the car manufacturers from voiding your warranty if you do your own routine maintenance outside the dealership - just save your receipts as proof.
Have you asked your dealer if they cover the battery under the CPO warranty? The fine print in the CPO says no, but I have heard of people with CPO warranties getting the 12v replaced for free by their dealer.
