Review by Eric L. Fletcher for Energizer 2025BP-2 Lithium Button Cell Battery (2 Pack)
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Hey fellow athletes. If you are using one of the new coded Polar WearLink chest straps, it has replaceable batteries. This is the one you want, and not the standard CR 2025, which is much more common. The size is just different enough that the CR 2025 will not work (trust me!).

Battery works well (of course- its a Energizer) and the chest strap is working like a charm again. Plus the two pack given you a spare for the future. They are pricey little buggers though.

Review by Andrew Tiller for Energizer 2025BP-2 Lithium Button Cell Battery (2 Pack)
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They’re batteries… They work… end of story.

They were the right kind, and they came quickly… the packaging was completely excessive (an envelope would have done instead of an enormous box (relative to the size of its contents)… but nonetheless, they came, they worked, and now so does my projector remote.

Review by G. Dombiak for Energizer 2025BP-2 Lithium Button Cell Battery (2 Pack)
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I have a polar rs400 watch and this battery works great in my chest strap. I replaced the old battery that lasted about 2 years and this battery is working just fine. Lets see how long it will last.