All four showed about 2.55-2.6V. Got two of them soldered in my keyfobs, returned the other two. Drove for about an hour today, 30ish minutes with each of the keyfobs. They have barely charged to 2.6-something volts. It is quite frustrating, as I'm not sure if I should expect any functionality with a voltage that low. We will consider the diagrams of relay boxes and fuses for the BMW E60 with a description of the purpose of the elements. Note the cigarette lighter fuse. Spare fuses and plastic tweezers should be included with the driver’s tool kit. The fuse list for your vehicle is located in the luggage compartment behind the right-hand side cover. The only way is to cut it open and then solder the new battery and glue the remote back on. Also the newer diamond shaped keys dont come apart that way. They use a lithium rechargeable that is not meant to be replaced. If it fails you either have to cut the key apart to replace it or buy a new key. I had an E46. The fob was built into the handle of the key, and was a sealed unit (able to survive trips through the laundry). They were charged wirelessly when in the ignition and the car was running. There were non-OEM, knock-offs available. Somebody dissected a real BMW key and one off the knock-offs. You get what you pay for. BMW E39 Key Initialization Procedure. The 1st pic below is the instructions for the old style (rubber head) key, the 2nd pic below is the instructions for the new style (diamond shaped) key & the 3rd pic is for the 2 button IR (infrared) keys that are not used here in the USA: Thanks Q! Edit: If the images in Q's post fail to load, I've hosted A few days ago after determining that I needed a battery replacement I went ahead and bought a new battery. This is my 1st battery replacement for the car under my ownership. I read through this major E39 battery thread started by bluebee before, during and after the install: Pictorial discussion of charging, testing, removing, & replacing the Watch Dylan’s tips on what to do and what not when replacing your lost BMW key fob.Skip to the part which interest you the most:0:00 Intro0:48 Deactivate you 2032 battery you need - Mwdhy.

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