How did you figure out it will only re-charge to 70%? I saw elsewhere that someone used a GT1 to determine that battery needed replacing.

Any way, or tests that I can run, to determine if my battery needs replacing?

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K