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Our E60s are energy vampires when sitting. A friend with a non-M model, left her's sitting for 6 weeks without trickle charging. The car had no pulse when she tried to start it.

With no charger available, per dealership instructions, I let the the dead battery charge via jumpers for 30 minutes before it would fire up, then drove it at highway speeds for 45 minutes. Battery still had to be given last rites.

The Battery Tender UFH mentions does the job at a reasonable price. :thumbsup:

Better batteries are sold for our cars: http://www.m5board.com/vbulletin/showthread.php?t=110068


Vexed - use the remote terminals under the hood for charging.
 
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