ReadMyMove

Pods, lights & battery

Can I replace the battery?

Pods with a plug-in battery can be opened by hand and the battery swapped. The first prototype pods have a soldered battery, so email us instead.

Yes, on most pods. The battery plugs in with a small connector, so you can open the lid by hand and swap it with no tools.

Prototype pods: the first handful of prototype pods have the battery soldered to the board. Don't open those. Email hello@readmymove.com and we will swap the battery for you.

What you need

  • A replacement battery: 3.7 V, 250 mAh, 30 × 20 × 5 mm, with a JST-PH 2-pin plug. Ask us for a matching spare.
  • A fingernail or a coin to open the lid.
  • Ideally a multimeter to check polarity.

Check polarity first

The red and black wires on batteries are not the same between suppliers. A battery plugged in back to front can destroy the board. Before you plug in a battery that didn't come from us, check with a multimeter that the contact meeting the pod's red wire reads +3.7 to +4.2 V. If it reads negative, don't use it.

Swap the battery

  1. Take the pod off its strap and unplug any cable.
  2. Put a fingernail or coin in the notch at the end opposite the USB-C port and lift the lid.
  3. Pull the connector out of its holder and unplug it. Hold the plastic housings, not the wires.
  4. Lift out the foam pad and the old battery.
  5. Put the new battery in the same way: wires at the end away from the USB-C port, foam pad on top.
  6. Plug in the connector and press it back into its holder.
  7. Close the lid and press both long sides until they click.
  8. Plug in USB-C to check that it charges.

Safety

  • Never puncture, bend or crush the battery.
  • If the lid won't close, don't force it. Check that the wires and foam sit flat.
  • Recycle the old battery at a battery collection point, not in household waste.

Updated 1 November 2026.

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Email hello@readmymove.com

ReadMyMove shows how you move. It does not assess injuries or health. If you have pain, see a health professional. If you're pain-free, there's no need to change something just because it differs from a typical range.