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.
The Fitbit Charge HR is Fitbit's latest big fitness move: it adds heart-rate tracking, something tons of bands and trackers have started adopting. It tracks heart rate 24 hours a day, even when you sleep. It syncs everything to your phone.