Can this be wired into the mains?

No. To connect to the main you need the FireAngel Pro FIREANGEL PRO HT-230 BATTERY BACKUP HEAT ALARM , which is mains powered and has a backup battery in the event of mains power failure. Amazon doesnt sell the, but you can get them cheap from screwfix

Can you send me the battery that wasn’t in the box?

The battery is built in and can't be replaced

can thiz be linked to other heat alarm

No. Also it states it lasts 10 years, I’ve had it replaced already and now the replacement alarm battery has gone with 5 years left on it. I now avoid FireAngel.

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Description

🔥 Protect your kitchen with confidence—because safety should never take a break!

DECADE LONG POWER - Sealed lithium battery guarantees 10 years of uninterrupted fire safety—set it and forget it.
FALSE ALARM FIGHTER - Smart silence button mutes cooking fumes without compromising your protection.
DISCREET TESTING MODE - Quiet test function lets you check your alarm without disturbing your day.
CERTIFIED PEACE OF MIND - CE & UKCA marked, BS 5446-2:2003 certified—trusted safety for home, caravan, or attic.
HASSLE FREE INSTALLATION - Quick twist-and-lock baseplate fits existing HT-630 mounts—upgrade your safety in minutes.

The FireAngel FA6720-R Heat Alarm is engineered for kitchens and challenging environments where smoke alarms fail. Featuring a 10-year sealed lithium battery, easy twist-fit installation compatible with HT-630 models, and a silence button to prevent false alerts from cooking fumes, it offers reliable, certified fire detection for homes, caravans, and more. Backed by a 5-year warranty, it’s the smart upgrade for millennial professionals who value safety without hassle.

Specifications

Manufacturer	FireAngel
Part Number	FA6720-R
Product Dimensions	11.8 x 11.8 x 4.1 cm; 131 g
Batteries	1 CR123A batteries required. (included)
Item model number	FA6720-R
Colour	White
Style	New Gen Alarm
Material	Plastic
Shape	Circular
Power Source	Battery Powered
Installation method	‎Install in a matter of minutes with only 2 screws required (not included) to secure the baseplate, then twist the alarm in to place
Item Package Quantity	1
Included Components	1 x Baseplate, 1 x Heat Alarm complete with Sealed Battery, 1 x Instruction Manual
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium
Item Weight	131 g

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