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Polar S1 foot pod battery: AAA

The Polar S1 foot pod takes one AAA 1.5V battery.

AAA

AAA× 11.5V battery

Also sold as LR03, E92, MN2400 · AAA details

Source: Polar S1 foot pod manual

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

    Quick answers

    Which battery goes in the Polar S1 foot pod?

    One AAA 1.5V battery.

    Is LR03 the same as AAA?

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