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I have my original battery in my March 10 build date 2011 e92 M3, it lives on tender charger when not driving, I had the dealership test it a few years back and they said it fine... I say run it till it dies...
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2011 E92 M3 | JEREZ BLACK | EXTENDED BAMBOO NOVILLO | EXECUTIVE PKG | M-DRIVE | EDC | M-DCT
MODS | KW S/O | HRE P40SC | Akra Evo |ESS Akra Tune | ESS DCT tune | BMC drop in | StopTech Trophies | TMS Pulley | LUX V3 | BE Bearings and BE ARP rod bolts
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