E46Fanatics - View Single Post - replacing battery in key fob....
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Old 06-14-2012, 01:11 AM   #374
Registered User
Join Date: Dec 2010
Location: Brisbane, Australia
Posts: 297
My Ride: 2004 E46 M3
Using a normal battery instead of a rechargeable is possibly not all that wise. An electronics engineer would know that.

The circuitry is definitely there to charge the battery and eventhough you have put a non-rechargeable battery in, it will still charge it which is probably the reason it is still operating. A normal battery will take an amount of recharging to a point where it will probably leak.

Also The 165mAh rating comparison is invalid. This is based on one charge. You are comparing the non-rechargeable running from 100% to 0% once (how it should be operated). The rechargeable battery can do this many hundreds of times.

All that said, my old E36 remote batteries where never replaced in the 6 years I had it using one key only. The E36 definitely did not charge the remote battery in the key. Not really sure why they changed to rechargeable actually.
Shonky is offline   Reply With Quote