Skip to content

SwitchBot Contact Sensor battery: 2 × AAA

The SwitchBot Contact Sensor takes two AAA 1.5V batteries.

AAA

AAA× 21.5V batteries

Also sold as LR03, E92, MN2400 · AAA details

Source: SwitchBot Contact Sensor spec sheet

Varta Longlife Power AAA 8 pack at Amazon for AAA 1.5V alkaline battery (affiliate link, opens in new tab)Energizer Max AAA at Amazon (affiliate link)

Before you swap it

  • Change all two at once. Don't mix old batteries with new ones or one brand with another, since the weakest one in the set drags the others down with it.

Quick answers

What battery does the SwitchBot Contact Sensor take?

Two AAA 1.5V batteries.

Is LR03 the same as AAA?

Yes. LR03, E92 and MN2400 are all the same cell as AAA, sold under another name.