Database Info

Monitoring battery life vs usage

On a Diamond I was using battery log to see the effect of various things, data use, push email, tf3d, screen brightness etc.
I was expecting to get best results from following the usual guidance of turn off whatever isn't being used, close programs, dim the lights and such.
I found that some programs do indeed use more memory and cause a bigger drain but many do not. Neither did a gprs connection when left connected.
However, i noticed spikes in battery when opening and closing programs, and disconnecting the data connection. Therefore from this it would seem that I am better off leaving programs open rather than re-opening them many times, and also leaving data connected.
Does anyone have any thoughts on this? This is assuming that abttery log is accurate, I don't want to slam it and say its rubbish, i don't believe it is. I am not sure HOW accurate it is though.
On a side note, people are advised that charging from teh mains is better for the battery. It is certainly quicker but i always thought that trickle charging batteries got them more fully charged (eventaully). Is that based on ni-cad rather than li-ion?
I haven't found either of these topics covered exactly as above so I hope this is not a repost.

I've done a lot of battery logging myself. There isn't really a correlation between memory usage and current flow, like most people think. Having repllog.exe idling in the background doesn't do anything to the battery, in my experience. I don't have data (and only get EDGE), so I can't comment on gprs and the like. Turning the screen off makes a huge difference in consumption. The one weird thing I notice on my fuze is that the current tends to cycle between a low state and a high state with the screen on; it doesn't do it with the screen off. So, if I'm listening to Core player with the screen on (just a random level), the device may alternate between 150 and 240 mA. With the screen off, it will hold steady at 90 mA. This is without any other apps running and with the phone off. Even with nothing running besides background processes and the screen set at 1, the current will fluctuate between 65 mA and 140 or so mA. It's mostly at the lower current, but the higher current consumes a lot of juice.
Long story short, if you're on a plane and are listening to tunes, turn the screen off. Or, if you're running your gps and are hiking or something and are keeping a gps log, again, turn the screen off. You can save a lot of battery that way.
Oh, yeah, I forgot to mention that for a while I tested out no2chem's clock control to see if it saved battery or not (this gets to the accuracy question). I would lower the clock speed on my fuze, and then start logging and compare the current draw under a similar situation at the normal 528 MHz clock speed. I never saw a difference in current draw, although the device would clearly slow down (sometimes too much to be useable). I'm not sure if tBattery was really accurate under those circumstances. It's possible that the lower clock rate messed up the log measurements by a proportional amount, but I just don't know.

I assumed that two-level jumping was because I was constantly opening and closing stuff to measure the effect, and there was a delay in battlog showing this.
I thought it could also be something to do with the radio, but you found it only happens with the screen on. Delayed reaction to the backlight dimming?

11 Tips to Boost Your Android Phone's Battery Life

Today's Android phones pack big bright screens and high-end features that suck plenty of power; here's how to squeeze the most juice out of your battery.
1. See what's sucking the most juice. Navigate to Settings > Battery to see an organized breakdown of what's consuming your phone's battery. Applications and features will display in a descending list of battery hogs. If you see an application you barely use or a feature you never use, you'll want to uninstall the app or turn off the feature.
2. Reduce email, Twitter, and Facebook polling. Set your various messaging apps to "manual" for the polling or refresh frequency, just as a test, and you'll instantly extend your device's battery life by a significant amount. Once you see what a difference that makes, try re-enabling just the most important ones, and possibly reducing their polling frequency in the process.
3. Turn unnecessary hardware radios off. It's great that today's phones have LTE, NFC, GPS, Wi-Fi, and Bluetooth, but do you really need all five activated 24 hours per day? Android keeps location-based apps resident in the background, and the constant drain on your battery will become noticeable, fast. If your phone has a power control widget, you can use it to quickly turn on/off GPS (the largest power drain), NFC, Wi-Fi, Bluetooth, and LTE. On stock Android, swipe down to bring up the Notification bar, and then tap the icon on the top right corner.
4. Use the extra power saving mode if you have it. The aforementioned Galaxy S5 and HTC One (M8) both have Ultra Power Saving and Extreme Power Saving modes, respectively, that limits the phone to texting, phone calls, Web browsing, and Facebook. This can squeeze extra hours or even a day of standby time out of just a few remaining percentage points of battery.
5. Trim apps running in the background. From Settings > Apps, swipe to the left; you'll see a list of apps that are currently running. Tap on each one to see what they're for; you can stop any apps that you don't need running in the background all of the time.
6. Dump unnecessary home screen widgets and live wallpaper. Just because they're sitting on the home screen, seemingly inactive, doesn't mean they're not consuming power.
7. Turn down the brightness and turn off Automatic Brightness. It's probably obvious at this point, but you'll be surprised by how much this one alone helps to improve battery life.
8. Update your apps. Applications often get updated to use less battery power, so you should make sure your apps are up to date. Even if you configured the phone for automatic updates, some apps still require that you manually install updates. Check for app updates in Google Play by hitting the menu key and going to My Apps.
9. Keep an eye on signal strength. If you're in an area with poor cellular coverage, the phone will work harder to latch onto a strong-enough signal. This has an adverse effect on battery life.
10. Check the reviews. We conduct battery life tests on every single Android phone we review. Unsurprisingly, the results vary widely between handsets, even on the same network. When choosing a phone, make sure that real world talk time is sufficient.
11. Buy a battery case or larger extended battery.

Niki Niki said:
Today's Android phones pack big bright screens and high-end features that suck plenty of power; here's how to squeeze the most juice out of your battery.
1. See what's sucking the most juice. Navigate to Settings > Battery to see an organized breakdown of what's consuming your phone's battery. Applications and features will display in a descending list of battery hogs. If you see an application you barely use or a feature you never use, you'll want to uninstall the app or turn off the feature.
2. Reduce email, Twitter, and Facebook polling. Set your various messaging apps to "manual" for the polling or refresh frequency, just as a test, and you'll instantly extend your device's battery life by a significant amount. Once you see what a difference that makes, try re-enabling just the most important ones, and possibly reducing their polling frequency in the process.
3. Turn unnecessary hardware radios off. It's great that today's phones have LTE, NFC, GPS, Wi-Fi, and Bluetooth, but do you really need all five activated 24 hours per day? Android keeps location-based apps resident in the background, and the constant drain on your battery will become noticeable, fast. If your phone has a power control widget, you can use it to quickly turn on/off GPS (the largest power drain), NFC, Wi-Fi, Bluetooth, and LTE. On stock Android, swipe down to bring up the Notification bar, and then tap the icon on the top right corner.
4. Use the extra power saving mode if you have it. The aforementioned Galaxy S5 and HTC One (M8) both have Ultra Power Saving and Extreme Power Saving modes, respectively, that limits the phone to texting, phone calls, Web browsing, and Facebook. This can squeeze extra hours or even a day of standby time out of just a few remaining percentage points of battery.
5. Trim apps running in the background. From Settings > Apps, swipe to the left; you'll see a list of apps that are currently running. Tap on each one to see what they're for; you can stop any apps that you don't need running in the background all of the time.
6. Dump unnecessary home screen widgets and live wallpaper. Just because they're sitting on the home screen, seemingly inactive, doesn't mean they're not consuming power.
7. Turn down the brightness and turn off Automatic Brightness. It's probably obvious at this point, but you'll be surprised by how much this one alone helps to improve battery life.
8. Update your apps. Applications often get updated to use less battery power, so you should make sure your apps are up to date. Even if you configured the phone for automatic updates, some apps still require that you manually install updates. Check for app updates in Google Play by hitting the menu key and going to My Apps.
9. Keep an eye on signal strength. If you're in an area with poor cellular coverage, the phone will work harder to latch onto a strong-enough signal. This has an adverse effect on battery life.
10. Check the reviews. We conduct battery life tests on every single Android phone we review. Unsurprisingly, the results vary widely between handsets, even on the same network. When choosing a phone, make sure that real world talk time is sufficient.
11. Buy a battery case or larger extended battery.
Click to expand...
Click to collapse
Thank you! It's a good idea

Thanks, great tips!
I had a question, does enabling "double tap to wake" consume more battery because the phone is always on the lookout for a touch or something even when the screen is off?

How to conserve batt life

Hey guys i just find it usefull press thanks if i help!!!
10 Tips To Conserve Your Smartphone Battery
By Michael Poh. Filed in How-To Guides
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Apple, BlackBerry, Samsung and other global brands have come up with smartphones equipped with powerful mobile operating systems such as Google’s Android, Nokia’s Symbian, Apple’s iOS, etc, that allows users to play games, listen to mp3s, snap pictures, have access to the Net and even stream videos.
Given their diverse range of capabilities and multi-functionality running on a mobile (as in on-the-go) platform, it’s no wonder that battery life has always been a concern for developers, manufacturers and the users themselves. On average, most smartphone batteries last between one and two days before being completely depleted, and in need of a recharge.
Increase Battery Life
(Image Source: Dokisoft)
While we wait for the hardware development to catch up, the alternative will be to conserve battery life. As it is with our energy levels, battery life can be effectively utilized and managed, leaving nothing to go to waste. Without a battery charger or a spare battery with you everywhere you go, you’ll have to make due with minimizing the consumption of battery juice.
Here are 10 essential tips how you can conserve your smartphone’s battery.
Read Also: Top 10 Security Tools For Your Smartphone
1. Turn Off Vibrations
Vibrations are great for notifying you about incoming calls or messages when you’re in the theatre, meetings or other places where it’s necessary to keep the phone silent. In places where it doesn’t matter, it will be better for you to use your ringtone as notification if you want to keep your smartphones on longer.
Vibrations actually use up more power than ringtones. The sounds produced by ringtones are just very tiny vibrations in your smartphone’s speaker. Compare that to the shaking of the entire phone via vibrating a smart weight, playing a ringtone definitely zaps less of your battery. The same applies for using vibration for tactile feedback. If you don’t think it’s necessary, then disable vibrations or at the very least, lessen the magnitude of the vibrations.
2. Dim Your Screen
This one tip affects battery life drastically. It’s obvious that dimming your screen will reduce your smartphone’s power consumption since we all have to activate the screen whenever we use our phones. If our screen is brightly lit up every couple of minutes when we check our emails and such, it eventually will zap battery juice. Auto-brightness setting enable the smartphone to adjust the brightness to its optimal level for reading while conserving battery life.
On the other hand though, you may consider tuning the level permanently to the dimmest level that you can still read under without straining your eyes. Doing so may do wonders to your battery life in the long run.
3. Shorten Screen Timeout
In the same manner, if you wish to minimize the power consumption of your smartphone of the screen display, you ought to consider shortening the screen timeout. This decides how long the screen will remain lit after you finish interacting with it.
Some of us do not have the habit of ‘locking’ the phone after we we are done with it; we just let it go lights out by itself. Keeping the timeout duration short will ensure that the phone doesn’t waste power when you’re not using it.
4. Switching Off When Inactive
Although it is true that turning on your phone consumes more power than unlocking your phone, switching it off for a couple of hours can save more battery than leaving it on sleep or inactive mode. If you know you’re not going to touch your phone for an extended period of time, such as when you’re attending a meeting or sleeping, you can actually cut down a significant amount of energy consumption if you simply switch it off.
You might be wondering why you should even bother about battery level when you’ve a charger with you at home while you sleep. Well, the thing is that repeated charging for certain kind of batteries eats up the battery volume. For such batteries, the best way is to conserve as much as you can so that your battery retains its original capacity as much as possible.
5. Charge Your Battery Correctly
Speaking of phone charging, there are generally two kinds of rechargeable batteries commonly used for smartphones: Lithium-ion (Li-Ion), and Nickel-based batteries: namely Nickel-Metal Hydride (NiMH) and Nickel-Cadmium (NiCd).
The battery capacity in NiCd batteries are reduced every time you recharge them. Nonetheless, NiCd batteries have longer life cycles i.e. they can be recharged more often than NiMH batteries before stop working. Nickel-based batteries should be charged (to the full amount) when they’re more or less out of power, and not when there’s still a good amount of energy left.
(Image Source: Slairea)
Li-Ion batteries have the longest life cycle among the three types of batteries but they also need to be charged more frequently (even when the battery is not fully used up) to maintain its original capacity. To keep your battery lasting longer, find out more about the type of battery that your smartphone uses and maintain the appropriate charging strategy for optimum usage.
6. Close Unnecessary Apps
Some of us open app after app and don’t bother to close them even after we no longer need to use them. This multi-tasking capability is a common feature of smartphones, but it is also a main reason why battery life gets drained away easily. The worst thing is that you’re losing battery juice when you are not even using them. Leaving them open will leave your battery at half-bar in no time.
As often as possible, kill your apps if you are not using them. There are some valuable apps out there that manage the multitasking ability of your smartphone to ensure it performs at its best to conserve battery life without jeopardizing usage. One such Android app is the Advanced Task Killer.
7. Disable GPS
Certain apps eat up more battery juice than others, particularly apps which utilize the GPS system to track your location. Your smartphone has a GPS unit that allows the sending and receiving of signals to and from satellites to determine your exact location, which is integral for some apps to work, for example, map-based apps like Google Maps or to check-in on Facebook.
(Image Source: Fotolia)
When left running in the background, some of these apps may continue to send and receive signals. It takes a lot out of your battery to continuously do that, even if you aren’t aware of it. Hence, you should ensure that those particular apps are closed when you really don’t need them. A more extreme way is to disable location services when prompted by these apps. It may slow down the efficiency of these apps but you won’t be tracked on your location and some users deliberately do that for privacy reasons.
8. No Bluetooth, Wi-Fi, 3G/4G When Not In Use
Energy is consumed whenever your smartphone searches for signals, Wi-Fi, 3G or Bluetooth etc. When the reception is poor, the phone will continue scanning to attain a good connection. Repeated searches for these signals can easily make your battery level drop a notch.
What I’m saying is that you should turn off your Wi-Fi or Bluetooth when you don’t need to be connected. One convenient way to do it is to switch to ‘Airplane Mode’ or just switch your phone off when you know you can’t get any signal.
On the other hand, when you need good reception for your smartphone, place or position your phone in high connectivity zones. This will prevent your smartphones from constantly seeking for a connection and wasting your precious battery power switching from one signal to the other.
9. Minimize Notifications
With constant connectivity to the Internet, we tend to get notifications on our smartphones all the time, be it updates on the latest news, emails, high scores from games, add-ons for apps etc. But I’m sure that you would only want to be notified on the more essential stuffs like new text messages, or messages from Whatsapp.
(Image Source: Taakoses)
Not only is it annoying to constantly receive irrelevant notifications that can actually wait, it is also a powersucker for each of these notifications. Every incoming notification will light up your screen, make a sound alert or vibrate.
Manage your settings well and disable unnecessary notifications to save a little battery power (and avoid being frustrated with these constant notifications).
10. Maintain Cool Temperature
Some of us might have observed that our battery runs out faster when our smartphones are warm. Put simply, don’t leave your smartphones under direct sunlight or in any place that is hot.
One of the more common occurrences would be leaving the smartphone in a car parked under the sun. The battery will function optimally in cooler environments, so do look out for, and try to avoid, scenarios where your phone is exposed to unnecessary and excessive heat.
Source:h tt p: //w w w .hongk iat.com/blog/conserve-smartphone-battery-life/

[How –To ] AMOLED SCREENS: Evidence of battery savings using black ,bright wall paper

EDIT: Please jump to post 4 for updated test results . Come back to this post for why this thread
There are umpteen threads on battery saving tips / methods and a few on AMOLED screens and battery savings. So why a new thread, could be the Question
Because
1.Battery saving means are meaningful if backed by numbers, else it’s subjective
2.Tests below were done on N7100, but given the popularity of AMOLED (two dozen and counting per Wikipedia), across cell phones and tabs, this may be interest to battery freaks and hence posting in general section rather than N7100 threads
3.Provide a replicable methodology of testing on your AMOLED device (rooted) both manually and automated. There are threads on XDA as well that suggest testing methodology but have not come up with easy testing methods and automating it unless I missed
I am NOT a qualified guy to understand the technical details of testing screen power nor of the methods/ apps used. There is enough material on the net to show how complex it is and savings using using dark screens vary from 18 to 41 %. IMHO, the jury is out and appears to be taking a long break
All I have done is put together various pieces to show a way of testing it and come up with results that are indicative and demonstrate trend lines.
Also the apps chosen for testing is not be misconstrued as canvassing for them.
There may be better ways of doing this test using other apps or better testing ways, which you are welcome to share here.
Test Device Configuration
GT-N7100 (t03g), ROM- Deep Impact (Morph variant) (Kitkat) by @Sammy_052
Kernel Agni- 3.0.101-India-v4.4.2-OC-INTL-STOCK_HYBRID-KitKat
Apps Used for testing
3C Tool Box Pro: Has a nice feature showing screen consumption in mAh (though on devices like mine which don’t have a current sensor, it is derived from battery drain percentage). Plus, it has the advantage of modules that can be accessed and test automated. Immense thanks to @3c , developer, who helped a ton
Darker : Screen Filter that was thoughtfully provided in the ROM. Free version allows darkening up to 50% as used for test
Stay Alive : To keep the screen alive for two hours (being the test duration), since the maximum screen time out is limited to 10 minutes in KitKat. 3C Toolbox offers a way of choosing apps , which keep screen on, as long as apps are kept in foreground. For some reason, this did not work with Nova Launcher as chosen app, hence the need for a different app. There are many free apps on Play Store with similar functionality and may be used after testing that they do not impact 3C
MacroDroid : To automate the test process. This is by @UndeadCretin and is a great tool to automate without a steep learning curve. The aim of click starting the test and getting results in mail box has been achieved (barring manual intervention in the first minute of starting the test) . The macro used for this is posted on the app thread. This macro can be easily tweaked and battery bugs can have a field day trying things like Live wall paper, under volting/over volting and altering CPU / GPU frequencies to see impact on power
Broad test Methodology (details later in thread)
Screen power usage was tested in 3 cases. Cell was kept in airplane mode to get cleaner results (optional) and Stay Alive used to keep the screen on for two hours ( targeting to get a drop of 10% battery level) for each test.
Case 1: Bright wall paper
Case 2: Bright wall paper with screen filter
Case 3: Solid black wall paper
Results of Testing ( files attached )
Case 1: Bright wall paper: Screen consumption is 195 mAh
Case 2: Bright wall paper with screen filter: Screen consumption is 189 mAh
Case 3: Solid black wall paper: Screen consumption is 172 mAh
Conclusions
1. Using a solid black wall paper as compared to bright wall paper shows 11 % savings.
2.Using a screen filter on bright wall paper shows very little savings 3% . Was surprised at this result and repeated the test and the results were practically same. This disputes the accepted belief that screen filters save power but is savings as low as this?
Internet reports savings from 18% to 40% by using black screen as compared to 11 % above, am guessing are due to a bunch of reasons, like testing methods, screen size, age of device, device to device variations, ROM, kernel settings, GPU/CPU voltage and frequency to name a few at device level .At next level, is the apps used, usage pattern of phone, algorithms used for dimming the phone and many more.
Testing as above is not real life. To carry out real life testing, ideally one would need to replicate activites for a fixed duration like calling, texting, browsing, watching stored video, on line music / video. I have not come across any app or way of doing this and would be happy to give it a shot, if someone can suggest a simple way
Detailed Test Instructions - To provide consistent testing environment and get clean results
1.Disable scheduled running of apps during the test and Greenify
2.Set the wall paper which you want to test and ensure sufficient battery
3.Run Stay Alive and use the second icon (red one) in the notification bar
4.Run Darker at your preferred settings for tests with screen filter
5.3C settings ( Thanks to @3c )
a)Settings>Recorder>Continuous recording enabled
b)Settings>Recorder>Time frame and Rate- depending on how long (maximum) you want to test and how frequently you want data to be updated, choose appropriate option . I used 12 hours, 10 minutes
c)Settings>Battery>Monitoring> mA retrieval method (if your device is listed choose, For Samsung devices, on enhanced estimated or estimated on the other side is pretty stable and the same for all devices, but often slower to update.
d)Settings>Battery>Monitoring>Estimate, use estimates drain, or if your device has a current sensor and reliably works choose use current sensor
6.Create shortcuts on home screen for battery statistics module of 3C using 3C widget
7.Start the test and go to markers tab and set the marker. You can create markers from the action bar or from history tab long pressing a record. Markers shows average consumption, be it mA or %/h (tap the value to switch). Min/max shows the range for the % or mV. Remember to show full history (not just % changes) by long-pressing the options and tapping “full history”.
8.Time the test and take screen shot of markers results
9.Repeat test for different cases
Looking forward to your views

Nice
Wow, this is a totally put together review. AmoLED screens save a lot of power on black, unlike LCD backed by light from LED where the entire screen needs to be on at all times when the screen is displaying anything. LED screens do not have a back light to support them in producing light. The individual pixels themselves produce the light. Hence if part of the screen is black, it means that, that part of the screen is off.
I had thought this through when making the rom in the first place and hence was the need in keeping all the elements either complete black or white. But samsung as a company decided to go away from this beautifying and practical aspect and the later phones have begun shipping with rather different set of colors.

Sammy_052 said:
Wow, this is a totally put together review. AmoLED screens save a lot of power on black, unlike LCD backed by light from LED where the entire screen needs to be on at all times when the screen is displaying anything. LED screens do not have a back light to support them in producing light. The individual pixels themselves produce the light. Hence if part of the screen is black, it means that, that part of the screen is off.
I had thought this through when making the rom in the first place and hence was the need in keeping all the elements either complete black or white. But samsung as a company decided to go away from this beautifying and practical aspect and the later phones have begun shipping with rather different set of colors.
Click to expand...
Click to collapse
Thanks for your view. It is fitting that you as ROM developer, included this aspect in your ROM and that is what triggered me thinking.
The test above is representative of a small portion of SOT, maybe around 10%. Real life usage is what needs to be measured and am searching for an app that can run fair amount of real life use cases. Only Antutu does something similar but requires user intervention to run. Ideal is auto play so that it can be automated through MacroDroid. Your thoughts around this are welcome
Sent from my GT-N7100 using XDA Free mobile app

Updated test results
So, i was stuck for long to do real life testing and it is done now !!!
A few major changes from the previous set up
1. ROM changed to wesam.othman v8 by @wesamothman
2. Better Battery Statistics (BBS) used in place of 3C Tool Box mainly because of ease of setting up and being more popular, eliminating process described in OP. But IMO, 3C Tool Box is far more versatile and powerful in studying battery usage
3. Most importantly, discovered Battery HD app (free) by Small Tech (https://play.google.com/store/apps/details?id=ch.smalltech.battery.free&hl=en). Very hand app and well designed. This app has on line calibration features using wifi browsing, streamning music and video. I wanted to extract these modules and incorporate in the macrodroid macro (part aim of this test is automation as mentioned in OP). Requested the developers and amazingly, they jumped in to help and created separate links for each of these modules so that i could call them in the macro to execute without any manual intervention. Extremely thankful to Santiago and Vadim of the team who made it possible :good:. Without their help, automation of this test could not have been possible. Thanks again !!!
Coming to the test , real life usage to the extent possible has been simulated except for gaming, calling , texts and social media apps. Test consits of 30 minutes of browsing, 15 minutes each of streaming music and video. Screen was kept on during the test duration and darker (screen filter) when used was set to 50%. Pics attached
Results
Case 1: Bright wall paper- Batterydrain was 10 %
Case 2: Bright wall paper with screen filter - Batterydrain was 9%
Case 3: Solid black wall paper - Batterydrain was 8%
So, this may be interpreted as- if you get 5 hours SOT for instance using a bright wall paper , you would have drained 50% of battery. But with using a screen filter on the bright wall paper, after 5 hours you would have used only 45% and the extra 5 % (over usage not using screen filter) would give you additonal 30 minutes of SOT !!!
And if you were using a solid balck wall paper instead, that would have given you an additional hour , making it 6 hours of SOT !!! ( Of course, this is assuming same usage and linear battery drain)
So, it is your choice, you can test it yourself
Happy battery life...cheers

iBestWin 10,000mAh (10A) Battery , AccuBattery &the Samsung Galaxy Note 4 n910f - RRm

iBestWin 10,000mAh (10A) Battery , AccuBattery &the Samsung Galaxy Note 4 n910f - RRm
Hello, Several days ago I purchased (courtesy of Amazon) an extended battery for the N910f & as many have mentioned knowing when to charge the Battery isn't easy for the casual user
(I'm more experienced than the average , have a fairly good knowledge of electrics - I'm mm electrician by trade - & computers / tech etc , but far from an expert compared to many on XDA)
Via the playstore I eventually (tried many) found this app called AccuBattery (Accubattery.zendesk.com) Which allows for the manual implementation of your batteries Basic specs
Here is a link to their manual :
https://accubattery.zendesk.com/hc/en-us/articles/210226065-Tab-1-charging-screen
Encompassing this I have disabled my battery icon & enabled the notification from the app to provide my battery reading & after several calibrations it appears to be reading accurately
I've accumulated serval screenshots for others to analyse ; being a forum all commentary is welcome

I'm easily able to get more than the 18hrs specified using it with my hot spot (for the note 3) , 4G / LTE , bright screen , Nightmare Cpu &Simple OnDemand governers (just straight performance) although I have underclocked the CPU as i have all 4 cores on (This works best for me less processing power but all cores working - very very smooth)

AccuBattery calculates the per app battery usage a bit differently than Android and many other apps (which can only accurately determine the phone's total battery consumption and then uses fixed profiles to estimate the distribution to each app). Instead, we have opted to calculate the phone's realized total battery drain whenever an app is in the foreground and assign all of it to that foreground app.
A benefit of this is that some apps have related background services running that the Android usage screen doesn't capture while we do. However, with our foreground method, we'll also capture background processes from other apps and end up assigning this to your foreground app (For example if you turn on an overlay and then stare at the clock app for an hour then all of that gets assigned to the clock app). We think it's a reasonable assumption though as the majority of the battery drain comes from the screen and many of the unrelated background services run regardless of which app is in the foreground. Furthermore, when the screen is off the background services don't get added up to the foreground app usage as nothing is considered to be in the foreground when the screen is turned off.
The average battery usage section shows you how we calculate our time remaining estimates and is based on the last 7 days of usage.
The fully battery time estimates give you an indication of expected performance on a 100% charge and might be a bit different to some other apps. You can read more about our time remaining estimates here: https://accubattery.zendesk.com/hc/en-us/articles/211277789