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The BMW Range
5 Series
E39
Diamond shape key rechargeable battery flat
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<blockquote data-quote="jarance" data-source="post: 617836" data-attributes="member: 21"><p>Reply your PM and your enquiry here.</p><p></p><p>I have read that it possible to replace a non chargeable battery in the key without much problem in other forum. </p><p></p><p>The coil for charging is not boost charge but trickle charge so overheating might not be encountered. </p><p>However, you might have to replace the battery every 6 months or so. I have charge alkaline battery (duracell) before even though it mention</p><p>that it is non chargeable.</p><p></p><p>As for the ability to start the car, it is because the RFID (Radio Frequency Identity) chip is a seperate circuit from the remote control</p><p>board. It is just resting on the PCB. Hence you can start the car but you cannot open/close the door via remote if the PCB is faulty.</p></blockquote><p></p>
[QUOTE="jarance, post: 617836, member: 21"] Reply your PM and your enquiry here. I have read that it possible to replace a non chargeable battery in the key without much problem in other forum. The coil for charging is not boost charge but trickle charge so overheating might not be encountered. However, you might have to replace the battery every 6 months or so. I have charge alkaline battery (duracell) before even though it mention that it is non chargeable. As for the ability to start the car, it is because the RFID (Radio Frequency Identity) chip is a seperate circuit from the remote control board. It is just resting on the PCB. Hence you can start the car but you cannot open/close the door via remote if the PCB is faulty. [/QUOTE]
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The BMW Range
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Diamond shape key rechargeable battery flat
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