Fitness & heart straps · 2017–2026

Polar H10 Heart Rate Sensor battery

The battery you need
It takes one CR2025: a coin battery, about the size of a nickel.
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2
How to change it
You’ll need: A coin
1. Open the cover
  Turn the battery cover with a coin.
2. Swap the battery
  Put the new one in with the “+” facing the cover. Keep the rubber ring in place.
3. Close it fully
  Turn the cover back until it stops so water can’t get in.
Where to buy it
As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.
Our pickThe exact match, 4-packEnergizer CR2025 3.0V Battery (4-Pack)
Check Price on Amazon →
Best value10-pack, handy to keep in a drawerCR2025 3.0V Battery Value Pack (10-Pack)
Check Price on Amazon →
Other brandDuracell DL2025, the same batteryDuracell DL2025 / CR2025 3.0V Battery
Check Price on Amazon →
Buttons open amazon.com 🇺🇸, picked from your country.
Remind me to change it
A new battery usually lasts about a year in this device.
That’s around October 2027.
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Also sold as
Any of these names is the same battery.
CR2025 DL2025 ECR2025 5003LC 6025
Other things that use CR2025
2017–2024 Mazda CX-5 Key FobTakes CR2025

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Questions people ask

What battery does the Polar H10 Heart Rate Sensor take?

It takes CR2025, a coin battery.

Can I use DL2025 instead?

Yes. DL2025, ECR2025, 5003LC are the same battery with other names.

How long will the new battery last?

Usually about a year, depending on how much you use it. Most devices warn you when it gets low.

About the CR2025

Size: About the size of a nickel
Thickness: As thick as 3 credit cards stacked
Power: 3 volts
Keeps in a drawer for: About 10 years
Rechargeable?: No, use once

Found in things like

Mazda & Toyota key fobsPolar chest strapsKitchen scalesCalculators

Everything about CR2025

Where to buy it

As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

Our pickThe exact match, 4-packEnergizer CR2025 3.0V Battery (4-Pack)

Check Price on Amazon →

Best value10-pack, handy to keep in a drawerCR2025 3.0V Battery Value Pack (10-Pack)

Check Price on Amazon →

Other brandDuracell DL2025, the same batteryDuracell DL2025 / CR2025 3.0V Battery

Check Price on Amazon →

Buttons open amazon.com 🇺🇸, picked from your country.

Questions people ask

What battery does the Polar H10 Heart Rate Sensor take?

It takes CR2025, a coin battery.

Can I use DL2025 instead?

Yes. DL2025, ECR2025, 5003LC are the same battery with other names.

How long will the new battery last?

Usually about a year, depending on how much you use it. Most devices warn you when it gets low.

Polar H10 Heart Rate Sensor battery

The battery you need

How to change it

Open the cover

Swap the battery

Close it fully

Where to buy it

Remind me to change it

Also sold as

Other things that use CR2025

Questions people ask

About the CR2025

Polar H10 Heart Rate Sensor battery

The battery you need

How to change it

Open the cover

Swap the battery

Close it fully

Where to buy it

Remind me to change it

Also sold as

Other things that use CR2025

Questions people ask

About the CR2025