Polar H9 heart rate monitor battery: CR2025
The Polar H9 heart rate monitor takes one CR2025 3V lithium coin cell.
CR20253V
CR2025× 13V lithium coin cell
Also sold as DL2025, ECR2025, KECR2025 · CR2025 details
Source: Polar H9 support page
Before you swap it
- A CR2025 is 2.5 mm thick. CR2016 and CR2032 look the same from the front, but they aren't the same cell, and a thinner one can rattle or lose contact.
Quick answers
Which battery goes in the Polar H9?
One CR2025 3V lithium coin cell.
Is DL2025 the same as CR2025?
Yes. DL2025, ECR2025 and KECR2025 are all the same cell as CR2025, sold under another name.
Will a CR2032 fit instead of a CR2025?
No. It's the same 20 mm width but 3.2 mm thick, against 2.5 mm for a CR2025. Use a CR2025.