Battery Monitor

Battery Monitor – Most Accurate On The App Store

App IconDownload on the App Store

Price: Free

Developer: Wern Jie
Latest Version: 1.2
Rating: ★★★★★ (4.2 stars)
Most Downloaded in: USA (est.)
Programmed using: Swift



Battery Monitor, the most accurate battery life monitoring app on the App Store. With its simple battery life calibration, you can get estimations with down-to-the-minute accuracy (±1min)! It also have a handy widget to access estimations anywhere!

This app contains calibration for battery usage, battery charging time and much more, making it one of the most accurate on the App Store! Don’t download those clones you find everywhere, download this app now!

• ±1 min battery life accuracy*
• ±1 min charging time accuracy*
• Simple interface, easy to use
• iOS Widget for easy access
• One time battery calibration

Download and enjoy! :)

If you have any problems, feel free to contact

• Accuracy is based on a perfectly calibrated device, which is required for high accuracy. Your device’s accuracy may vary.

• Estimated values may sometimes progress up and down, but usually the first estimated value is the most accurate.

• Battery life time remaining means how long you can use your phone continuously, unless specified in calibration settings.

• This app’s charging speed calibration is currently only optimised for iPhone. Charging time accuracy may vary on iPad.

• Even if the app doesn’t work as expected, you’ll still get is around ±10 mins accuracy, and is still one of the most accurate on the App Store.



If you have any problems or want to seek further queries, please send a feedback at the application feedback page instead.


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20 thoughts on “Battery Monitor”

  1. I want alerts when an app is draining my battery. Like today, I realized Facebook has used up 33% of my battery! If an app is using more than 1.5% per minute in foreground or 0.5% in background, it should immediately alert me.

  2. I switched my battery from a 2900 mA hour to a 3500 mA hour is the calibration going to compensate for this bigger battery? iPhone 7plus
    Nice app……

    1. Hi there,

      What do you mean the app doesn’t work? It doesn’t do anything other than showing your battery level and predicted time remaining. It doesn’t really have work to do.

    1. Hi Roy,

      The calibrate section of the app allows you to calibrate the app’s calculations of the time remaining till battery reaches a certain stage (for example, calibrating the time estimated for the battery to drain).

      Tapping on “Battery Usage Time Remaining” for example, will allow you to start a calibration of the calculated time of how long can your battery last. It simply measures the amount of percentage drop (when your battery is within the range of 60%-40%) while you use your phone and estimates the rate of battery drainage, which then updates the calculation of the time in the large “xh xm” counter in the main screen of the app to your usage. This process is pretty accurate and if calibrated properly, is able to yield accuracies of within ±1 minute, where your phone will run out of battery almost exactly as stated by the app.

      Hope this helps! :)

  3. Hi,
    Is there a Way to see which apps that are using power?
    I have a problem with drainage and it would be Nice to see If a particular app drained in the background .
    Best stef

    1. Hi there,

      Due to iOS limitations, the app cannot help determine which apps are using too much power. However, you can go to iOS Settings > Battery > Battery Usage and you can see which apps are using the most power on your phone.

      Hope this helps! :)

  4. Love the app so far, but the clock seems to be off somehow, possibly due to Daylight Savings?

    For instance, I’m in Philadelphia EST, time is 10:54am, and app says it will be fully charged in 3 minutes at 11:57am, but it should say at 10:57am. .

    iOS 11.1.2 iPod Touch 6th Gen

    1. Maybe I didn’t allow it time to calibrate. Now it is saying it will be another 52 minutes trickle charging by 11:51am, which is correctly 52 minutes from now.
      So it looks like it is working. I’ll reply to this post if I see a clock error again.

      1. Hmm… Based on your reply, this looks like an error with the “hour” part of the calculation, since you said it now states “11:51am”. Hence, I can conclude the 11:57am you previously saw is probably the correct calculation while the “0h 3m” is wrong. For now, you may rely on the time rather than the minutes and hours while I fix this issue.

        Thanks again for reporting about this! :)

  5. Love it and the best app I’ve downloaded so far and I tested a few dozens of them and this is just simple and great
    One issue though not optimised for iPhone X
    Pls do it asap
    Eagerly waiting…..