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How to store a Car for the Winter

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kick99
Join Date: Jan 2012
Posts: 11
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2012-01-11          182013


I am wintering a 2003 500SL. It has second battery in the trunk for electronic accessories. I understand I need only trickle charge the trunk battery. Is that correct?

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How to store a Car for the Winter

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auerbach
Join Date: Sep 2007
Posts: 2168 West of Toronto
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2012-01-13          182056


Standard batteries self-discharge at something like 5% per month and are susceptible to non-recoverable freezing if it's cold enough and long enough.

So you want to keep both up. One way would be to run the car for a half-hour at least monthly. Another is to attach a trickle-charger, say alternate weeks. Charging the main battery probably spills over to the trunk one -- confirm with an M-B guy.

The third way is an update of this: attach a "smart charger" and forget it. This type monitors the voltage and only when it drops, it applies current. The trickle version usually gives 1.5 amps instead of just 1, which would be good for two batteries. But I don't know how your batteries are inter-connected, and which one's voltage the charger would respond to.

There are other storage-protection options but for just a few months, maintaining the batteries should suffice. ....

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