Replaced the battery in my spare key for Big Red. Remote functions have never worked and the wife had to use it recently and she didn't like having to put the key into the door to open it. LOL!

Turns out the old battery was probably good but was not being charged because the negative solder joint had broken on the circuit board. It read 2.81v on the meter and the replacement I put in read 2.98v. At any rate, I don't have to worry about it again. Re-initialized both of the keys and we now have 2 fully functional keys again. Much cheaper than BMW would charge.

__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)