[General Topics] italianquadcore:
I have just ordered Teclast APS-KI018WE power charger ( https://www.gearbest.com/c=hargers-cables/pp_1627689.html ) at Gearbest, so to have another quick charger that supports Mediatek Pump Express feature.

About Mediatek Pump Express feature, at this website ( https://gadgetstouse.com/news/mediatek-pump-express-charging/44855 ) the author is discussing about the specifications of Pump Express. As with ROCK power charger I achieved 14 watts (9.09 volts - 1.53 amperes), and according to above-mentioned website, we can consider T10 capable to support Pump Express Plus, Pump Express Plus can reach 15 watts (9 volts - 1.67 amperes) or 24 watts (12 volts - 2 amperes). I just want to know if there is another power charger able to reach the second charge value, that is 24 watts / 12 volts. It may be that Teclast APS-KI018WE may reach this value? I will discover it....

Surfing on Internet, I've also found a PWM AC/DC Controller compatible with specifications of Mediatek's Pump Express Plus fast charge protocol, called iW1788, manufactured by Dialog Semiconductor company ( https://www.dialog-semiconductor.com/products/power-conversion/acdc-embedded/iw1788 ). According to PDF file downloaded on above-mentioned website, the Pump Express Plus protocol can have Output Power from 7.5 watts to 25 watts. I have no idea if this micro-circuit is integrated into Power chargers and/or into Tablet T10, anyway it is important that we have it, and that we know that T10 may be capable to support up to 24-25 watts of charging power.

About the doubts that MTK Pump Express charge technology may harm the T10 tablet after a lot of quick-charging time, I am really doubtful that this may happen. As far as I have understood in these last years of experience about low-level knowledge of Android system, the battery charging feature is under a mix of hardware and software control. Software means the Android Kernel, hardware means the electronic circuit that manages/handles the charge/discharge of the battery. About the kernel, we can be sure that all T10 kernels have the Pump Express enabled (otherwise we wouldn't have 14 watts or even more during battery charge), so in this case we have nothing to do. About hardware, I have no informations if Teclast has included a protection circuit in order to avoid any overheating during battery charging and to properly protect the battery during quick charging. I only discovered that, during tests of my power chargers, since level 90% (more or less), the power of battery charging fastly falls down, in this way the last part of the charge (I estimate from 90% to 100%) is very very slow, may be to avoid any kind of stress on battery (we have to consider that T10 has got a 8100 mah battery). On the other hand, some people suffer from a rapid discharge of the battery from 15% to 0%, for this matter please read below.

Regarding my previous post about thread on TechTablets forum ( https://techtablets.com/forum/topic/teclast-t10-battery-issue-mtk-quick-charge/ ) , I try to answer to the posts included in that thread. In that thread one guy has got a ROCK power charger, this power charger worked well in the first few days (10 days), then it became very slow on charging. When we have to do with a battery charger, we have to consider all the following matters:

1) people did not write if they have upgraded (or not) their firmware. As I've written here above, kernel affects power charging, so it may be that Teclast has upgraded some parts of the kernel in their latest firmware, so to limit battery overheating or to avoid any stress on battery. We have also to consider that with T10 we have devices E3C5, E3C5_G and even E3C6, it may be that something is changed with these devices about battery and/or charging operations.

2) people did not confirm if they have used the original usb cable or other cable. In my tests I have not used the original usb cable provided by Teclast, but I have used a third-party high-performance usb cable. A faulty usb cable or low-quality power usb cable may seriously affect the quick charge operations.

3) people did not confirm about temperatures, of both environment and tablet. The thread was started at November, may be that environment temperature was too high or too low. Temperature inside (but also outside) tablet may affects the charging operations. As I've written before, I have no idea if Teclast provided a protection circuit against the overheating (battery overheating and/or SOC overheating). So the internal/external temperature is to be considered during charging operations.

4) we have to consider the ROCK power charger itself. In my last years on using smartphones and tablets, I asked for a replacement/refund for at least 4 power charger, due to coil-whine, buzzing, overheating and even weak electric shocks. We must take care of all the procedures used by the power charger in order to enable the Quick Charge. If even one of the conditions (internal and external temperature, electrical stability, charging quality of the usb cable, good conditions of the internal circuits, external conditions given by the receiver device) are not properly respected, the power charger may disable the quick charge technology and work using a safe/slow charge.

5) we have to consider the Android system itself. It may happen that some apps or some internal services may use the CPU more than necessary so to increase the temperature or even cause instability on all the Android system. In this case we have to consider to shutdown the device (or simply to reboot it). We do not forget that in T10 we have Android 7.0, the first Nougat major release. It may be that these issues may be solved on Android 7.1.x.

6) And last but not least, the battery itself. We have no idea about the quality of the battery included in Teclast T10 (for example we do not know which is its manufacturer), we only know its capacity (8100 mah). We could have a faulty unit, a battery that fastly may degrade or even deteriorate. And if there is an internal circuit inside tablet that monitors the current conditions of the battery, that circuit is capable to make a choice between slow or fast charge, according to current conditions of the battery.

I listened some rumors about battery drain, mainly with battery level quickly going down from 15% to 0%. Searching on Internet, I found some webpages regarding a file called "power_profile.xml", used by Android to compute the statistics but also used by the standby. In Android source code ( https://source.android.com/devices/tech/power/values ), the page begins with "Device manufacturers must provide a component power profile in /frameworks/base/core/res/res/xml/power_profile.xml". This file is included in source code, but with T10 we have not any source code, so I just read this thread ( https://android.stackexchange.com/questions/145263/where-are-the-battery-capacity-files-located ), I just use the file "/system/framework/framework-res.apk" inside firmware and extract it using Apktool utility so to have the original "power_profile.xml". I attach this file in this post, this file is the same on firmwares v1.28 and v1.32. A sample file, with descriptions, can be found on Android Source Code ( https://android.googlesource.com/pl...e/+/master/core/res/res/xml/power_profile.xml ).

If the above-mentioned file "power_profile.xml" doesn't include the proper parameters, it may seriously cause battery drain, as described on this webpage ( http://www.mobilenapps.com/articles/3425/20120801/samsung-galaxy-s3-battery-drain-issues-fixed.htm ), so if you have problems of battery drain, please share this issue on this forum, in order to let other people be aware of it. Thanks.