u/vishnusai24

I have a OnePlus 13R (CPH2691) running OxygenOS 16.0.8.300 (EX01V30P01).

I recently tried the most hyped battery "calibration" method that many people recommend:

• Drain the battery to 0%

• Let the phone switch off automatically

• Charge it while powered off for 1 hour 30 minutes

• Turn it on

After doing this, I noticed several strange issues with the built-in battery statistics.

1. Why is "Used since last full charge" showing 14–15 days?

Instead of resetting after a complete charge, it kept showing:

• 14 days 15 hours

• 14 days 16 hours

• 14 days 17 hours

• 14 days 19 hours

• 15 days 11 hours

How is this possible after charging the phone to 100%?

Shouldn't this counter reset after a full charging cycle?

2. Why is Screen-on Time already several hours immediately after charging to 100%?

After unplugging the phone from 100%, the Screen-on Time didn't reset.

Instead, it already showed values like:

• 4h 50m

• 5h 06m

• 5h 17m

It later increased normally, and currently I'm at:

• 31% battery remaining

• 7h 49m Screen-on Time

But why didn't the Screen-on Time reset after a complete charge?

3. Why is Screen-off Time decreasing instead of increasing?

During the same discharge cycle, the Screen-off Time changed like this:

• 2h 57m

• 2h 54m

• 2h 55m

• 2h 42m

• 2h 30m

• Currently: 2h 09m

As far as I know, Screen-off Time should only increase, not decrease.

Is this a bug in OxygenOS?

AccuBattery vs OnePlus Battery Stats

I'm also using AccuBattery Pro, which currently shows:

• 100% → 31% battery

• 6h 40m Screen-on Time

• 19h 29m since unplugging

Meanwhile, the built-in OnePlus battery page shows:

• 7h 49m Screen-on Time

• Used since last full charge: 15 days 11 hours

The two apps are reporting completely different battery statistics.

My Thoughts

At this point, it feels like the built-in battery statistics on OxygenOS are inaccurate or not resetting properly after a complete charging cycle.

The phone also reports 100% Battery Health, but when the battery statistics themselves appear inconsistent, it's difficult to know how reliable the battery reporting actually is.

Questions

• Is anyone else experiencing this on the OnePlus 13R?

• Is this a known OxygenOS 16 bug?

• Is there any way to reset or fix the battery statistics properly?

• Have you noticed similar inconsistencies in Screen-on Time, Screen-off Time, or "Used since last full charge"?

Any insights would be appreciated.

I recently updated to the New Android version