Changing Battery in the Key??? - MINI Cooper Forum

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post #1 of 18 (permalink) Old Apr 20th, 2007, 02:54 PM Thread Starter
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Changing Battery in the Key???

The battery is running low on my Mini key (2004 model) its becomming so bad that i have to stand next to the car to open it! I know how to open the key and change the battery. The question is: Will it still work after?
I have heard that you have to take it to the dealer to get the battery changed, because it "flashes" the key and it will no longer work on the car. Is this true? if so, how much will this cost?
I do have a spare key which works, but to be honest, its in perfect condition and i dont wanna use it unless i need to e.g. i lose the other key or something.
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post #2 of 18 (permalink) Old Apr 20th, 2007, 03:52 PM
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The battery is running low on my Mini key (2004 model) its becomming so bad that i have to stand next to the car to open it! I know how to open the key and change the battery. The question is: Will it still work after?
I have heard that you have to take it to the dealer to get the battery changed, because it "flashes" the key and it will no longer work on the car. Is this true? if so, how much will this cost?
I do have a spare key which works, but to be honest, its in perfect condition and i dont wanna use it unless i need to e.g. i lose the other key or something.
In theory the key shouldn't need the battery replacing; they recharge while they are in the ignition, though if you don't drive all that often it could slowly 'bleed' flat. If that is the case, use it manually in the door lock and it will recharge when it is in the ignition. Or you may have a bad battery and it just won't hold a charge. Do note that they don't work seem to work that well in some areas, those with lots of radio waves and other electronic interference. And if you don't use the spare key occasionally, it too will eventually bleed out.
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post #3 of 18 (permalink) Old Apr 20th, 2007, 05:32 PM
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The 2004 MINI's did have a normal battery which needs changing. The R56 recharges the battery in the "key" when driving with it in the ignition slot.

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post #4 of 18 (permalink) Old Apr 20th, 2007, 05:55 PM
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Apparantly there have been several types of key battery fitted over the years.

To quote XRV848

Quote:
The key was changed for the 2005 model year.
The 2004 owner's manual (USA) says:
"Replace (battery) if it is no longer possible to unlock the vehicle via the remote control...Only use a battery of the type specified on the battery, CR2032..."
The 2005 owner's manual says:
"In every master key there is an extended life battery that is charged automatically in the lock as you drive"

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post #5 of 18 (permalink) Old Apr 21st, 2007, 09:14 AM
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As to the radio waves comment, i have always wondered why i could lock and unlock the car from much further away at night, also different parts of town i can open it from further than others!
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post #6 of 18 (permalink) Old Jul 18th, 2011, 02:14 AM
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Time to re-open an old thread

I have an R56 MINI Cooper S race car. I've got the central locking working and the key will unlock / lock both doors but the remote buttons do absolutely nothing.

Yes, this should be the recharging type, and yes that means I shouldn't have to crack it open to change batteries, but as this one looks dead as a Dodo, does anyone know how to open the key? At least that way I can put a multimeter over it to see if the batt is dead or if there's other issues.


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post #7 of 18 (permalink) Old Aug 31st, 2011, 02:18 PM
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Time to re-open an old thread

I have an R56 MINI Cooper S race car. I've got the central locking working and the key will unlock / lock both doors but the remote buttons do absolutely nothing.

Yes, this should be the recharging type, and yes that means I shouldn't have to crack it open to change batteries, but as this one looks dead as a Dodo, does anyone know how to open the key? At least that way I can put a multimeter over it to see if the batt is dead or if there's other issues.
Well I have a 2003 Mini One D, it has a replacement battery, cos I had it confirmed by BMW, who also showed me how to get to the battery..

lever the cover off with a small screwdriver from the base of the key....

change the battery within 30 seconds... or you are in trouble...

put the cover back on and you are done...
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post #8 of 18 (permalink) Old Aug 31st, 2011, 09:19 PM
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Yup. They changed the keys in 2007 I used to have a 2002 Cooper with the same style of key and yep easily changed.


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post #9 of 18 (permalink) Old Jul 16th, 2012, 10:25 AM
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Exclamation Futher help

Does anyone have URLs for where you can actually get a key battery as mini is dead dead dead. If I can whip the old one out and then whisk the new one in in under 30 seconds then that sounds good to me. Just don't know where to get one from.
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post #10 of 18 (permalink) Old Jul 16th, 2012, 01:52 PM
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Does anyone have URLs for where you can actually get a key battery as mini is dead dead dead. If I can whip the old one out and then whisk the new one in in under 30 seconds then that sounds good to me. Just don't know where to get one from.

Hi,

Any Maplin electronics will stock this battery , if you tell us the model and year of your mini we can tell you what battery to get

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post #11 of 18 (permalink) Old Jul 16th, 2012, 01:56 PM
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Hi,

Any Maplin electronics will stock this battery , if you tell us the model and year of your mini we can tell you what battery to get
Brilliant, thanks!

They came to take my poor little mini away to repair the fact it's totally overheating and I couldn't complete my 66 mile journey on the m'way yesterday evening - I've only had it 2 days!!!!!!!

They are going to sort the key for me as I added it to my snagging list not to mention that we can't open the passenger door from inside!
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post #12 of 18 (permalink) Old Jul 16th, 2012, 03:16 PM
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No problem , hope everything gets sorted out for you

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post #13 of 18 (permalink) Old Sep 27th, 2014, 05:39 PM
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what battery does a 2006 hatchback key take?
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post #14 of 18 (permalink) Old Sep 30th, 2014, 12:21 PM
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It's the safest to ask a dealer I think. With some models it's better if they change it.
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post #15 of 18 (permalink) Old Dec 14th, 2014, 08:49 PM
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First generation keys:

'01-'04: Used a two button, clamshell shaped key. This key is easily opened with a flat blade screwdriver and the CR2032 battery is easily changed. This key is NOT recharged in the ignition switch. This is why it uses the CR2032 key, which is a 3 volt Lithium, non-rechargeable battery.

'05, '06 and some '07: Used a three button, flat shaped key. This key is sonically welded at the factory and not easily opened. I forget the number as I do not work on these keys but the battery is inductively charged by the ignition switch and not easily changed as it is soldered in place.

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