Polar F6 HRM battery is dying... replace it yourself?

I LOVE my Polar F6. But the screen is getting dim and it's not always accurate. I think it needs a new battery. A quick MFP and Google search educated me to the fact that I need to SEND it to Polar to get a new battery??? Can this be true? The cost to replacement could run a bit high from my research...

Has anyone tried to replace the battery on their own?

I'm thinking to upgrade to the latest Polar may be the next option...

TIA!
Georgia

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