Great! Glad it's working again!
It is possible to replace the battery - and I'd have to check but I think we may have a few replacements in stock still.
However the short battery life might not be the battery, but some slight short in the circuitry causing a high power draw - I guess you could try charging the battery up and see if you can measure the voltage across it when it's charged? If it's getting 4.2v when charged but the watch is still reading low then it's likely that increased resistance on the board is what's making it read the voltage as very low.
I guess it's also possible that the resistance has meant that something that draws a bunch of power (like the GPS) is turned on? 8 hours of life is about what you'd expect if that's what it is.
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