Panasonic OEM battery. The battery will require soldering to the remote board.
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Tuya ZigBee Smart Button Scene Switch Multi-scene Linkage Wireless Key Switch Battery Powered Automation Need Zigbee Gateway
Aliexpress UK
REPAIR SERVICE FOR BMW CAR KEY REMOTE FOBS 1 series 3 series 5 series. However it is very rare that we are not able to repair a key. Clean/inspect and repair the circuit board. This repair service is what you require.
eBay
CR2032 3V Lithium Battery 2-100 PCS, for Car Key Fob Watch Calculator Toy Glucose Meter Scale, Wholesale Coin Cell Batteries
Aliexpress UK
However it is very rare that we are not able to repair a key. Clean/inspect and repair the circuit board. Battery not charging or draining after a short period?. This repair service is what you require.
eBay
2-10PCS CR1620 3V Lithium Battery Button Battery Compatible with for Watch Key Fob Calculator Car Remote Remote Control Toys
Aliexpress UK
REPAIR SERVICE FOR BMW CAR KEY REMOTE FOBS 1 series 3 series 5 series. Clean/inspect and repair the circuit board. However it is very rare that we are not able to repair a key. This repair service is what you require.
eBay
2-10PCS 3V 200mAh CR2032 lithium battery CR 2032 DL2032 ECR2032 watch toy calculator car key remote control button battery
Aliexpress UK
1X Duracell Battery.
eBay
5-50PCS Original PANASONIC CR2450 Battery 3V Lithium Coin Cell for Car Key Fob Thermometer Medical Devices CR 2450
Aliexpress UK
Ensure that your key matches the one in the photos - the battery provided will only fit this key . GENUINE DURACELL LITHIUM BATTERY.
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For M18 Lithium Battery LED Power Display Stickers LED Key Label For Milwaukee 18V 48-11-1815 Li-ion Battery Pack
Aliexpress UK
Panasonic Accumulator Battery. Compatible Models: Used in BMW keyfobs and many other applications. Note the characteristics solder pins of this battery are oriented at 90 degrees to each other.
eBay
MOES Tuya ZigBee Smart Key Switch Mobile Setting Wireless Remote Key Controller Multi-scene Linkage Smart Switch Battery Powered
Aliexpress UK
REMOTE KEY RFC 3 BUTTON RECHARGEABLE CELL BATTERY FOR BMW 3 X5 Z3 E46 E53 E85.
eBay
Tuya ZigBee Smart Key Switch Wireless Remote Control Key Controller Multi-scene Linkage Smart Switch Battery Powered Automation
Aliexpress UK