The Charge HR is the cheapest model with a heart rate monitor and has a battery life of about 5 days.

How to get more battery life from your Fitbit Charge HR Both options will save some juice, but of course turning it off completely will have the greatest effect. You can adjust this feature to be less frequent or turn it off all together. Having your Fitbit remind you to move every hour is a neat feature if you're stuck behind a desk all day, but it will put a slight drain on your battery. Turning off this feature is sure extend your battery. Quick View lights up your Fitbit's screen when you flick your wrist towards you and sometimes can activate when you don't want it to. So try and avoid obsessively checking your statistics. When you tap your Alta it will scroll through your statistics and use more battery power. However, there is one more helpful bit of knowledge that could save you some battery power: With many of the same features as the Charge, many of the tips are the same. The Fitbit Alta rechargeable battery is said to have a battery life of approximately 5 days. How to get more battery life from your Fitbit Alta Turning of this feature is sure to prolong you precious battery power. If you are using the Fitbit app to track your data, turning off All-Day sync will stop your Fitbit from trying to transfer data constantly, thus using less battery. If you find yourself setting lots of alarms, try to cut back. Each active alarm will decrease the battery life a small amount. When you tap your Charge it will scroll through your statistics and use more battery power. Here are a few tips to get a little more juice form your Charge: A lot of that has to do with the fact that it uses Bluetooth Low Energy, which simply put means it uses less power to maintain a Bluetooth connection. The Fitbit Charge has the longest battery life (approximately 7-10 days) of any Fitbit with a clock.

Fitbit charge 5 battery life