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Old 01-29-2013, 02:48 PM
stuartjohn24 stuartjohn24 is offline
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Location: Chippenham, Wiltshire, UK
 
Join Date: May 2011
Posts: 667
Mein Auto: BMW E65 745i
^ +1

I'm pretty sure BMW sell a trickle charger for this purpose.

There is a switch in the boot above the power module and fuse box, you can switch this over if you are not using it for long periods, this may help you. I understand it puts the car into a low power state to conserve battery power if you go on holiday. Im not sure if it will be that beneficial for you if you use it say twice a week. Give it a try.
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