Ionic data on long run and battery life

[JoyfulStephanie]

My Fitbit had a disastrous day - during my most important run - my first 20km.

My battery was at 100%.

The only app I use on my Fitbit while running is GPS.  Music is from my cell phone carried in my water belt, using bluetooth to my wireless headphones. I did receive a few text message notifications on my Fitbit during this run. Maybe I have to turn off notifications on long runs? 

I started my run at 12:48pm. I have proof outside of my Fitbit as I sent my husband a text just before I started running.

I turned around at exactly 10.00km to head back to where I started to equal 20.00km

My Fitbit died at 17.49km

I arrived at my doorstep at 3:30pm exactly. I know this because I immediately walked into the kitchen for a drink of water and looked at the time on the stove. 3:30pm.

Here is where the discrepancy lies:

• According to Fitbit my run lasted 3:37:47 min.
• I left at 12:38pm and arrived home at 3:30pm. That equals = 2:52 min
• My pace should be approximately 7’66” per kilometre
• Fitbit has me at 12’26”

I'm concerned for a few reasons.  Mainly how this would happen? Maybe I've miscalculated, as math isn't my strongest skill.  If I'm not wrong, how could my Fitbit be so wrong?  

Is there a way to maintain battery life for marathons?  How will my Fitbit last during really long runs?  The whole point of owning a Fitbit is to help me keep track of distance and pace.  

Thank you for taking the time to read this.  Hopefully, this is an anomaly, but has me not having a lot of faith in my Fitbit.  I would appreciate feedback, especially on how to extend battery life on really long runs.

I've attached two pictures below of the results mentioned above. 

Thank you,

Stephanie

I've attach

Moderator Edit: Clarified subject

[SilviaFitbit]

@JoyfulStephanie It's nice to see you on the Community. Thanks for taking the time to share screenshots of what you're experiencing with your Ionic. 

The estimated Ionic battery life when using built-in GPS is 10 hours. You may want to check these tips to extend your watch's battery life. 

All devices with GPS sensors require a direct path to GPS satellites to calculate location. A weak GPS signal might affect the accuracy of your route and other activity data. Your device uses your step count to calculate distance until it finds a signal, so the total distance calculated for a workout may be slightly less accurate when GPS isn't available for the entire time.

Please follow these tips when using GPS on your Fitbit Ionic:

• Charge your device to at least 80%, as built-in GPS can cause the battery to drain more quickly.
• Start your exercise and connect to GPS in an area where you have a clear view of the sky.
• If you are using GPS for the first time in an area, connecting may take longer than usual.

Additionally, you may want to add your stride length to your Fitbit account, follow the instructions on this article. 

Please try the tips mentioned above and let me know your results. I'll be around if you have any additional questions.