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Old 04-03-2010, 11:47 AM
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dwm dwm is offline
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Location: White Lake, MI
 
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Mein Auto: 2002 M roadster
When I had a stock battery, I also found that float charging with the Battery Tender appeared to be contributing to water loss when I left it connected for a whole winter. I assume the pulse-mode maintenance of the CTEK (after 10 days of float) is better on that front, but I am not sure since I haven't had a wet battery in the roadster in quite some time.

The Odyssey batteries seem to like the 'snowflake' mode, and I suspect that's true of the BMW AGM batteries also.
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2002 M roadster
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