The units run outJun 2028.
eBay
Rechargeable 9V Battery USB-C Charge,21800mWh Long-lasting 9V Li-Ion Battery with Free Cable,for Smoke Alarm,Camera,Clocks,Audio
Aliexpress UK
Not in original box.
eBay
EVE CR17450 3V primary battery is used for smoke alarms, water meters, PLC servo drivers
Aliexpress UK
The units run out2031.
eBay
New 9V 9800mAh Lithium ion Rechargeable Battery Long Lasting 9v Li-ion Batteries with Cables for Smoke Detector Microphone Alarm
Aliexpress UK
AICO Ei141RC Smoke Alarm Mains / Battery Back up - Ionisation Detector. The units run out Dec. Nov. 6 x Oct 2030.
eBay
16340 3.7V 700mAh Rechargeable Lithium Battery with Connector Wires CR123A USB Cable for Camera Smoke alarm Fan Monitor Headlamp
Aliexpress UK
The units run outOct.
eBay
USB 9V Rechargeable Battery 1200mAh Type-C Rechargeable 9V Li-ion Battery for Helicopeter Model Multimeter Smoke Alarm
Aliexpress UK
The units run outNov 2032.
eBay
Soshine 3.7V CR123 800mAh Battery 16340 800mAh Lithium Rechargeable 500 Cycle Discharge for Smoke Alarm Laser Pointer Flashlight
Aliexpress UK
Product life span: 10 year. Battery life: 2 x 1.5 V AA (replaceable battery Included) replaceable battery Included. Sounds a loud 85 dB alarm. Optical smoke sensing technology detects slow smouldering fire.
eBay
14250 3.7V Lithium Battery CR2 1200mAh for Flashlight Cordless phones Smoke alarm Infrared laser sight Walkmans Laptop Toy
Aliexpress UK
Resistant to nuisance alarms. Sounds a loud 85 dB alarm. Alarm sound pressure: 85db/1m. Alarm current: ≤ 160mA. Product life span: 10 year. Battery life: 2 x 1.5 V AA (replaceable battery Included) replaceable battery Included.
eBay
12V/24V/220V Strobe Siren Alarm Waterproof Safely Security Alarm Strobe Anti-theft Alarm Warning Light Flashing Led Strobe Lamp
Aliexpress UK