Have any of you guys ever replaced the battery in your Diamond key? I have an 06 325ci and my battery is practically dead to where I can barely open my trunk with the remote. Does anyone know ways to recharge the battery without replacing it or have any of you swapped out the battery on one of...

HI, I replaced my OEM battery with an Optima. It is the best battery out there in the world at the moment. I measured the dimensions on OEM and the fixture in the trucnk of my 2001 330 CI DINAN and then called Optima tech support to find a battery that would fit it. Nothing will pop up for BMW...