accessories » BMW charger

Hi. Just would like info if anybody has any issues with BMW's own trickle charger. Just checked mine and noticed it was on charge about 88%. It felt very warm, so put a thermometer on top just out of curiosity. went back 5 mins later and checked temp. Showing 30 c. Should I be concerned or do they normally run at those temps when charging. Any feedback would be appreciated.

Hi Wessie. I can understand any charger getting hot if its in fast charge mode, however I believe BMW,s is just a trickle charge so I wouldn't of expected it to be that hot. Quick update just popped into garage. Thermometer now reading 35 c. Charger saying battery at 98%.

I have a 12V BMW charger that I bought about 10 years ago. I would plug it in after every ride while my battery was likely almost fully charged. It would be warm to the touch, but certainly not hot. The charger is rated as having a maximum output of 240 mA, so that low output is not going to cause any problems, although it might take a long time to recharge a discharged battery. Since I have switched to lithium batteries on my BMWs, I am currently using an Optimate lithium battery charger, which is rated at 12.8 volts with an output of 800 mA. After a ride it only takes about 5 minutes before it stops charging and go into a "test" mode, whatever that is.

Zitat von Marky64 im Beitrag #1

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Hi. Just would like info if anybody has any issues with BMW's own trickle charger. Just checked mine and noticed it was on charge about 88%. It felt very warm, so put a thermometer on top just out of curiosity. went back 5 mins later and checked temp. Showing 30 c. Should I be concerned or do they normally run at those temps when charging. Any feedback would be appreciated.

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I have the same BMW charger, it gets warm to the touch, but not hot, and once fully charged, it switches to standby mode for a few hours and the back to trickle charge, also leave mine plugged in and on most of the time.

Mine gets warm, but not too hot to handle. I've used the charge % to evaluate the health of my batteries. The RS's battery was taking longer to get to 100% so I recently replaced it (almost 4 years old). The 10 year old Odyssey in my S comes up to 100% fairly quickly (I'm amazed).

Frank