Anyone replaced their key battery? - The Unofficial BMW M5 Messageboard (m5board.com)

Gus · 14th December 2007, 16:05

I got a low charge warning - just wondered whether it loses all the settings when you change the battery..

unfoundhorsepower · 14th December 2007, 16:35

Low charge warning pertaining to your key ???? never heard of it .

rjp71 · 14th December 2007, 16:52

Placing the key into the ignition (not sure what the actual term is for it) and it will charge the battery. I will do this if I am going on an long trip etc... Try driving with the key inserted in the ignition for a couple of days (even for short trips and the low battery warning will go away.

Scott in Houston · 14th December 2007, 17:12

are you sure it charges it? I couldn't find that in the manual, and the batteries it uses are 'chargeable'. They're just typical disc batteries.

rjp71 · 14th December 2007, 17:15

Quote:

Originally Posted by Scott in Houston

are you sure it charges it? I couldn't find that in the manual, and the batteries it uses are 'chargeable'. They're just typical disc batteries.

Scott:

I'm pretty sure I remember hearing that from the SA when I purchased the car. I don't have the manual handy to check.

sechsgang · 14th December 2007, 17:15

^^ Yup, atleast if you have comfort access...I dont remember if the non-comfort have it...

andrewsherman · 14th December 2007, 17:21

I am fairly certain that it is the opposite. I believe that cars without comfort access will charge the keyfob battery when it is in the ignition slot. Comfort Access keys do not charge in the ingnition slot.

Way2fast · 14th December 2007, 17:26

I just started getting that message this week. I put my key in and then I remembered I keep my wife's key in the glove box and so I will try charging that. I just hate driving it to her settings.

Scott in Houston · 14th December 2007, 17:28

Quote:

Originally Posted by andrewsherman

I am fairly certain that it is the opposite. I believe that cars without comfort access will charge the keyfob battery when it is in the ignition slot. Comfort Access keys do not charge in the ingnition slot.

I have comfort access, and I'm guessing you're right because the battery in our fob is not a chargable battery. It's something you buy at Radio shack for small electronics and isn't designed to be charged.

NB · 14th December 2007, 18:24

Quote:

Originally Posted by Gus

I got a low charge warning - just wondered whether it loses all the settings when you change the battery..

I may be wrong on this as it was quite some time ago.

I don't think it looses the settings, I changed my battery ages ago after a small problem, got in the car and all the settings had changed, but then realised I was using the other key

.

So you should be fine, but I was supprised that the settings were stored in the key.