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How to Recharge a BMW E90/E91 Key Without Opening It

Model: BMW Serie 3 E92, E90, E91 - Years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Part: Key

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Video tutorial

BMW keys recharge while in use, and it takes 30 hours for a full charge. If you leave the key in the car without using it, the key will discharge, which is a hassle because the key cannot be opened.

Our YouTuber conducted an experiment by looking inside a BMW key and found that the battery is soldered to the CPU, making it non-replaceable. He then created a small device; a sort of homemade charger that someone with electronics knowledge can replicate, to charge the key without placing it in the vehicle, and in just a few hours; much less than the 30 hours required under normal circumstances.

It's worth a try.


Updated on 22 June 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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