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      12-13-2016, 11:27 AM   #1
Chappers 71
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Key fob

Had a low key battery warning light come up today, no worries I thought I'll use the spare until I can get a new battery. I put the spare in & the battery's also low on that one

I have done a search on how to open the key but the only vids I've come across are for comfort access & there's a little panel which pops out with the help of a screwdriver. Unfortunately my key doesn't have the panel on the back to pop out.
Anyone know how to open non comfort access key to change the battery?
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      12-14-2016, 04:19 AM   #2
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They're not designed to be opened as the battery recharges when you stick it in the ignition. So if you do open it and replace the battery make sure it's a rechargable one. I've heard they are soldered in as well.
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      12-14-2016, 04:38 AM   #3
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Also, do You use that key daily? If not, maybe You need to recharge it on a longer trip. If yes, then You will need a new battery.
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      12-14-2016, 06:07 AM   #4
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Have just spoken to my local dealer & it seems the battery's are rechargeable. & can't be replaced.
It does seem strange that I'm getting low battery for both keys, but then they are the same age.
BMW parts guy says book it in for a diagnostic, not for a 120 I'm not. He says I most likely need two new keys at 130 each..ouch.
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      12-14-2016, 02:27 PM   #5
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Used the car this evening put the key in & no low battery warning, tried the spare & that's now ok as well. Strange
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      12-15-2016, 11:36 AM   #6
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I regularly switch keys, say every month or two. If you haven't used your spare key for 3 0r 4 years, don't be supprised it's dead when you come to need it
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      12-15-2016, 01:26 PM   #7
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I do use the spare every couple of months or so.
Both keys are now good, no low key battery warnings
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      12-16-2016, 08:23 AM   #8
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It looks like they have charged
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