Check how long you've been using
HTC One since the last charge.
You can also see a chart that shows how long the screen has been on, and how long you've been using connections like the mobile network or
Go to Settings, and then tap
If you've used
HTC One for a long time since the last charge, swipe left or right to scale the graph that details battery usage over time.
You can also slide two fingers together or apart to scale the graph.