E46Fanatics - View Single Post - replacing battery in key fob....
View Single Post
Old 11-20-2012, 05:17 AM   #389
Registered User
Join Date: Dec 2010
Location: Brisbane, Australia
Posts: 297
My Ride: 2004 E46 M3
It really shouldn't drop in voltage that much when transmitting. Have you driven around with it for a reasonable time to charge the battery? The battery should have enough charge to work initially

Also have you re-synced the key to the car since replacing the battery?

If you soldered it in, there really can't be bad battery contacts. The spot welds to the battery are either connected (or not)
Shonky is offline   Reply With Quote