Battery tender

[carenthuziast]

For those who have an E93 and winterize, is it better to have the hard top up or down? Are the mechanisms and pistons in a relaxed state when the roof is down, thus a better position to winterize?

[Exclusivs]

Originally Posted by dparm

FYI if you get the original Battery Tender, there is an AGM/gel model. I think it was like $40 on Amazon when I bought it a few months ago.

Believe you are right, happened to be looking @ these the other day. They're a quality brand in this field, I'd contend possibly even better then BMW trickle unit. But when to use a trickle , and when to use an actual charger?

Originally Posted by admranger

Que? Think about this for a minute. When you put a new battery in, the modules are without power. It's ok. What the modules don't like is voltage variation; something that can happen with a failing battery.

Disconnect the negative battery terminal when you store the car.

Make sure the battery is fully charged up prior to use.

(Sorry for dense question; how can you check batteries current "health" or charge status?)

[admranger]

Originally Posted by Exclusivs

Believe you are right, happened to be looking @ these the other day. They're a quality brand in this field, I'd contend possibly even better then BMW trickle unit. But when to use a trickle , and when to use an actual charger?



(Sorry for dense question; how can you check batteries current "health" or charge status?)

Without an expensive battery tester you can't. I just plug the charger on the new battery as a matter of course. They can sit on the shelves for a long time before someone buys them.