We have tested our Travel Tracker thoroughly and it hardly uses any additional battery power when tracking your route!
How much battery does Polarsteps use for a full day of tracking?
In general, Polarsteps will use about 4% of your battery for a full day of tracking your route in the background. This percentage can be a bit lower or higher depending on your exact device and circumstances. It should never be a lot more. Of course, when you use the Travel Tracker mode "high accuracy" on Android, this percentage can be a bit higher.
Note
If you have the Polarsteps app opened on your phone a lot, this percentage will of course be higher because opening an app consumes energy (just like opening any other app).