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 HR also uses a more traditional clasp instead of the Charge's snap-in band, and it gets five days of battery life instead of seven days. Sitting at the top of Fitbit's line up is the $250 Surge, which despite its smartwatch-like appearance is more serious about fitness tracking than any of Fitbit's cheaper models.