ivanof900

So I’m having some trouble with my 06 e55. The battery seems like it’s being drained by something. I jump the battery and it seems to work but as soon as I turn it off the battery drains in like 10 minutes what could it be? The battery itself is almost brand new so I don’t think it’s that. Has anyone had something like this ? Or what are some issues that could cause this that I should look over. TIA!

machild

If it is draining a significant amount in 10 minutes then you have a substantial direct short. If you did have a short like that it would likely be a problem with running. You really need a way to read the current draw on the battery both running and not running. One possilbe is a bad alternator (shorted diode) which can drain a battery in a relatively short time frame. If that is your issue, it will drain fast enough that you will see the battery voltage dropping over a relatively short period. Plus, the alternator will likely not be charging the battery properly when the engine is running. A functioning alternator should be giving about 13.7v - 14v+ to the battery when the engine is running. Report back what you find and good luck.