BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


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      07-21-2019, 12:36 PM   #1

Drives: bmw
Join Date: Jul 2015
Location: uk

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Charging Battery

I'm after some advice to do with charging my 118i convertible battery due to its health being low as the car only gets used every other week and even then the journeys are short, under 10 miles.
I have read that you charge it from the posts in the engine bay but wanted to know is it okay to lock the car while i leave the charger connected and charging.
Thanks in advance for any help.
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      07-21-2019, 02:55 PM   #2
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Drives: N54 e82
Join Date: Feb 2010
Location: Bayern, Germany

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Arrow Get a CTEK charger...

Yes, it is ok to lock the car while on a trickle charger. In fact it's preferred way to charge in since most cars have Comfort Access(CA) and the car needs to "go to sleep" in order to have the least amount of draw on your car's battery.

There are connection points under the hood. But with ,ost good chargers you can also hardwire the connectors at the battery or under the hood as well.

I would highly recommend a CTEK unit. Mine ran me about 60 euros off of ebay. Not only do you need a trickle charger... but a unit like the CTEK won't over charge the battery and ruin it. The CTEK's will "cycle" the battery and condition it. It's really worth it.

Some photos on my 135i...
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      07-21-2019, 08:22 PM   #3
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Drives: Sedona 128
Join Date: Apr 2011
Location: Ottawa On Canada

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I recommended a CTEK to my son (even tho I use two Deltrans) but after moderate use over about 10 years, the Mode switch broke. We were able to find a replacement and solder it in. Can't remember now but there is 1 small issue with new switch.
The Deltrans have been in use all winter for about 15 (lead acid) and 10 years (AGM). I could also recommend Schumacher.
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