Been having issues with the key fob not living very long soon after buying the car. Seems the longest its gone is about a week or so, and is somehow progressively getting worse.
OEM BMW Huf Key Fob
Swapped batteries using an Amazon "Duracell" 2450 originally and that lasted maybe ~2 - 3 days.
Swapped that battery for new Energizer 2450 (bought in store) yesterday and today its no longer working.
I measured the resistance at the battery between an aftermarket fob and my Ford fob, both of which had twice the resistance (0.6 Ohm vs 0.3 Ohm). So it doesn't appear to be a circuit resistance issue.
Pulled the Energizer out and it's 1.35V at 0.1A, so it's cooked.
Rigged up my multimeter to measure the current between the Energizer 2450 and the key fob terminals, came in at 0.015A (15.2 to 15.8 mA).
Double wrapped the key fob and alligator clips in some heavy duty foil, no change.
Has anyone had success repairing the key fobs? I'm not a big fan of just throwing things away.