awaschka

Between self-discharge and non-operating loads, how long should an H-9 AGM battery last in storage in the car before needing recharge?

We were away for a while and I put a Victron BlueSmart 12V/5A maintainer on the battery while we were gone. The battery required 53 Ah of charging for 37 days, 49 of which occurred in one charging session at the end of the period. I think that translates roughly to a discharge rate of about 60mA. The H9 is a 100Ah battery, so the battery maintainer had to replace a little over half of its capacity in 37 days

Does this seem normal, or do I have a battery or current drain problem?



Thanks,
Al

jl-c

60ma does not seem excessive. Over 100ma and I would be searching for an issue. Porsche's as far as I can remember are supposed to "go to sleep" after a week when the remote control function switches off to save the battery. However, I have a sneaking feeling ( just my opinion) that when connected to a battery tender, the car 'senses' it and does not power down totally. HTH