The coolants they use are supposed to last the lifetime of an air conditioner, but accidental damage, wear and tear, contaminants and other issues can spring up. In these cases, the air conditioner may need a charge of coolant after the issues are fixed.
The Fitbit Surge comes equipped with a rechargeable battery made of lithium-polymer. It takes roughly about 1 â 2 hours to charge a Surge fully. Fitbit Surge has the longer battery life of 7 days per charge than other Fitbit products. 1  Plug the cable into the USB hub of your computer.  Then plug the other end into the port at the back of the Surge.
Re: sync issue. Ok, so my HR is working and syncing for about the last ~45 minutes, with several of syncs in there. What ended up helping was a factory reset of the Charge HR itself. You then have to re-connect it to your account (I removed it from my account via the FitBit website previously), and it seems to correctly keep time and sync. You will lose any sync data that is currently on the watch.