It is the explaination . I have to find why .batteries are 9900 mAh GTF
That’s why. The 9900mAh batteries are false advertising. There’s a thread about it: Large Capacity Batteries in uConsole . Regardless of the advertised capacity, most of the Chinese batteries on Amazon are about 1000-1200mAh. There’s a link in there to a video, a place to buy reasonable batteries, etc. I haven’t used the store they link to, but I have had the same experience with Amazon batteries; I have had the best luck with the MXJO brand, the A06 lasts 4-6 hours on that easily. If you try out sudo powertop, you can see a lot of information, the screen brightness takes more power than the CPU sometimes.