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Hive Window or Door Sensor battery: CR123A or CR2

It depends on the version: sensors bought from November 2016 takes one CR123A battery; sensors bought before November 2016 takes one CR2 battery.

sensors bought from November 2016

CR123A

CR123A× 13V battery

Also sold as CR17345, DL123A, EL123AP, RL123A · CR123A details

Source: Hive Window or Door Sensor support page

Energizer 123 lithium at Amazon for CR123A 3V lithium battery (affiliate link, opens in new tab)Duracell CR123A at Amazon (affiliate link)

sensors bought before November 2016

CR2

CR2× 13V battery

Also sold as CR15H270, DLCR2, KCR2, EL1CR2 · CR2 details

Source: Hive Window or Door Sensor support page

Energizer CR2 lithium at Amazon for CR2 3V lithium photo battery (affiliate link, opens in new tab)Duracell CR2 at Amazon (affiliate link)

Before you swap it

    Quick answers

    What battery does the Hive Window or Door Sensor take?

    Sensors bought from November 2016: one CR123A 3V battery. sensors bought before November 2016: one CR2 3V battery.

    Is CR17345 the same as CR123A?

    Yes. CR17345 is CR123A, and CR15H270 is CR2: same cells, other names.