Good afternoon,

Experiencing a battery drain on my late 2011 L322. I've read through many of the forum posts and appreciate this can be attributed to a vast number of causes. Hoping a forum member can provide help me solve this jigsaw.

Battery is going flat after being left for ~4 days.
Battery is less than one year old.
Removed the battery, charged to 13V, which quickly dropped to 12.7V as expected. Overnight this dropped to 12.5V.
When reconnected to the battery terminals, the measured voltage is only 12.1V, indicating a voltage drop!
I haven't been able to connect a clamp on current meter, or connect my DMM in series (haven't got the required amp rating) but I did follow the forum guidance and measure the mV across each fuse in three fuse boxes with the vehicle 'asleep', without finding anything remarkable.
Battery voltage didn't drop too much on starting.
Alternator puts out 14.9V when running.

Extras on the vehicle - deployable sidesteps and I believe there is a tracker fitted from the paperwork that came with it.

Any advice would be greatly appreciated.

Kind regards,

N

Last edited by FFN on 18th Sep 2020 9:24am. Edited 2 times in total

If your battery dropped from 12.7V to 12.5V overnight whilst disconnected from the car after having been freshly charged I would be inclined to have your battery checked even though it is only one year old.
If possible you could try charging the battery again and leave it disconnected for a few days and see what happens.