Battery Replacement for your Polar H7 Heart Rate Monitor

Polar H7 heart rate monitors are awesome. They run on bluetooth low energy, which for me is great because the fewer devices tracking my workout, the better! However, if you find it’s time to change the battery (you experience erratic heart rate data or drop outs or no data at all), here are your step-by-step instructions. Users rejoice–your inner handy-person awaits!

Photo 1: Intact battery

Directions to change battery:
1. Using a coin, open the battery cover by turning it counterclockwise to OPEN. Remove the cap.

2. Using a sharp edge (knife), lift the battery out from inside the cap. See Photo 2.

3. Insert the battery (CR 2025) inside the cover with the positive  side against the cover. Note: the positive side is also the side with the writing; insert the battery with writing side down. Make sure the sealing ring is in the groove to ensure water resistance. See Photo 1.

4. Place the cover back into the connector. Be sure to do this carefully by lining the arrow on the outside of the lid directly with the dot on the connector next to OPEN.

5. Use the coin to turn the cover clockwise to CLOSE.

Note: When changing the battery, make sure the sealing ring is not damaged, in which case you should replace it with a new one. You can purchase the sealing ring/battery kits at well-equipped Polar retailers and authorized Polar Services.

For more information about using the Polar H7,  read the manual.

Photo 2: Battery being lifted from the cap

Photo 3: Battery successfully extracted!

The Three Main Causes of Battery Drain During a Workout

For most people, the iPhone battery life is more than sufficient to complete your Fitdigits workout. Then there are the hardcore athletes. If you fall in the latter group, here are a few tips to make sure your iPhone will have the battery life necessary to complete a multiple hour run or ride. For a complete list of ways to optimize battery life, visit the Apple Website or the Fitdigits page on Battery Life. Here are the 3 most important ways to optimize your battery life:

1. Reduce Screen Brightness/ Lock Screen
The higher the screen brightness, the more battery life is used. You can lower your iPhone’s brightness by opening your iPhone Settings -> “Display and Brightness, and adjusting your brightness accordingly. You can also change screen brightness by swiping up from the bottom of the screen. A better option for extending battery life is to lock your screen while you are working out. To do so, tap the Sleep/Wake button on the top right of your iPhone. Fitdigits will continue recording data even though the screen is black.

2. Turn off Location Services
Mapping your route may be cool, but it drains your battery and is not particularly useful if you frequently run or ride the same route. If you are looking to maximize battery life, you should turn Location Services off. To turn off Location Services, go to your iPhone Settings -> Privacy -> Location Services, and turn “Location Services” to OFF.

3. Turn on Airplane Mode
If you are going on a very long ride, turn on Airplane Mode to turn off Location Services, Wi-Fi, Notifications, and ability to receive and make phone calls.