Accurate I've been using this for years now, this is really accurate especially if you're not using the original battery. Which is my case. But everything depends on the ROM (custom + root) and all the tricky things you do to your device.
My go to battery monitoring app It has a nice widget on my home screen, and a wealth of info about my battery, my usage history, etc. I've been using the free version for years and it's time to give the developer his due!
Been using for years now Tried a few others like it but no one comes close damn fine job and it keeps improving and impressing
After update to Android 6 no longer shows battery percentage bar and widget does not update
Great Used this app for years. Great for monitoring battery and evaluating cords and chargers.
calibration True battery calibration, thanks!
Battery Monitoring only, 3C Toolbox Pro available at http://www.3c71.com/at
Fix battery empty statistics on non-rooted devices
Add support for Asus ZenPad mA reporting
Enable edit/new battery from all battery tabs
Fix possible FC opening battery manager
Fix mA discovery on Android 7.0
New material app icon
Rename to 3C Battery Monitor
Android N compatibility update