2

I found this product (check the product here) on Amazon. Can this product be able to calculate the power of my phone's battery if connected to the USB port of my phone? I want to check the original capacity apart from what the manufacturer or any file on Android says.

Will the phone's USB port output the required power for this function?

I tried 3C Battery Monitor, the app says it's 1580mAh, but its 2100mAh in websites and on the battery (it's a phone by a well-known manufacturer, but I don't want to say it here because I don't want the answers to be focussed to the phone make or the model).

  • Do note that battery capacity will wear down over time. The 3C app likely observes and reports the current full capacity, while the website gives factory (new) capacity. – Andy Yan Apr 10 '17 at 10:10
  • Is the calculated capacity be trusted? I found here (android.stackexchange.com/questions/145263/…) that the app uses two sources, one of which is the Android APIs. Android APIs can be edited if there's a root access, so it I modify it, does the app find the actual capacity? – Neeraj Apr 10 '17 at 10:37
  • What about the device I've provided in Amazon (amazon.in/detector-voltmeter-ammeter-capacity-voltage/dp/…)? – Neeraj Apr 10 '17 at 10:37
  • Tested again. This time, it is 2333mAh for the same phone. – Neeraj Apr 11 '17 at 6:58
  • Then I'd say that the app itself reads inaccurately. Refer to @beeshyams 's answer. P.S. Personally I have a small in-line meter (shown in this question) to measure battery capacity through fully charging, though I admit that's not for everyone. – Andy Yan Apr 11 '17 at 7:25
0

I am basing this answer on the concerns expressed in comments and your main question

  • Firstly, there are many ways of measuring mAH of batteries with different results, so the device manufacturer is the best person to ask this question- it claims to read battery capacity but how it measures is not known from the product description. There are different methods for hardware measurements with varying results ( a subject in itself ). See this to get a feel

How to measure capacity of a Lithium-ion battery - Electrical Engineering Stack Exchange

0

You could try the accubattery app, it is known to give a somewhat accurate reading. It also gives other quite interesting information about your battery.

  • It's nice to know about the app, but the device runs on Android Jelly Bean, which is not supported by AccuBattery. – Neeraj Apr 10 '17 at 10:30
  • I have one of those devices for my custom built race drone, I use it to check voltages so I am not sure how accurate it is on mAh. I dont think its necessary to buy such device for your use case, the apps are accurate enough. – Jamal Mahroof Apr 10 '17 at 10:42
  • Thanks for the review about the device. But I am concerned about the Android battery API files which might be accessed and modified if there is root permission. What if I modify the file to, like 3000mAh, do the apps provide exact value for capacity? – Neeraj Apr 10 '17 at 11:03
  • @Neeraj I dont quite understand what you mean by that however most of the battery calculating apps use algorithms that measure the mAh going into the phone while charging, and how long it takes to increase per percent. There isnt a single android file that tells you the true capacity of your battery after wear. – Jamal Mahroof Apr 12 '17 at 8:08
  • Apps are inaccurate. I've been testing for four days where I get four different readings - 1580mAh, 2333mAh, 2335mAh and 864mAh. What I mean in the previous comment was "In the question here android.stackexchange.com/questions/145263/… by beeshyams, it says about the file where battery capacity information is stored. In my findings, not only battery, but even the CPU clock speed are stored in files in /sys/. So, may be, the apps are accessing those files to get mAh?" – Neeraj Apr 12 '17 at 9:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.