Quote:
Originally Posted by GiantRobot
I've been doing a bit of research and the CTEK Lithium US (around $90 on Amazon) seems highly rated (and appears to be used by a few folks here). I believe BMW sells a like charger (it's just a rebranded CTEK) that is a bit more expensive but charges both lithium and lead acid batteries.
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I'm using the CTEK Lithium US for the F90 M5 and it's been fine. Gets very warm during the first phases of the charge, but settles down in the maintenance portion. I used a trickle charger for the F10 M5 also, and even though I never drove it during a winter, the AGM battery in it lasted 6 1/2 years. With the cost of the lithium ion batteries in the F90 I hope I can do as well, or better.