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Das inoffizielle Android-SystemhandbuchDas inoffizielle Android-Systemhandbuch
Buy at Amazon for €7.00
Crosstour Mini Projector, Full HD 1080P Projector DLP Pockets Video Projector for 3000mAh Outdoor Batteries, Supports Home Cinema Projector for HDMI/Laptop/iOS/AndroidCrosstour Mini Projector, Full HD 1080P Projector DLP Pockets Video Projector for 3000mAh Outdoor Batteries, Supports Home Cinema Projector for HDMI/Laptop/iOS/Android
Buy at Amazon for €179.99
Oukitel WP5Oukitel WP5
Buy at Amazon for €125.99
Ulefone Armor X6 Outdoor Smartphone Without Contract Cheap IP68 Rugged Mobile Phone Android 9.0 4000mAh Battery Quad Core 2GB + 16GB 5 Inch HD 5MP + 8MP Dual SIM GPS Face Unlock, X6Ulefone Armor X6 Outdoor Smartphone Without Contract Cheap IP68 Rugged Mobile Phone Android 9.0 4000mAh Battery Quad Core 2GB + 16GB 5 Inch HD 5MP + 8MP Dual SIM GPS Face Unlock, X6
Buy at Amazon for €84.99
HUAWEI Y6 2019-L21a / Dual Sim SmartphoneHUAWEI Y6 2019-L21a / Dual Sim Smartphone
Buy at Amazon for €94.95
Omars Power Bank Version 37Omars Power Bank Version 37
Buy at Amazon for €18.99
Mini Camera WiFi Battery Surveillance Camera - BOYIJIA HD 1080P Small WiFi IP Nanny Cam with Motion Detection and Automatic Infrared Night Vision, Portable Micro Wireless Camera for Indoor and Outdoor UseMini Camera WiFi Battery Surveillance Camera - BOYIJIA HD 1080P Small WiFi IP Nanny Cam with Motion Detection and Automatic Infrared Night Vision, Portable Micro Wireless Camera for Indoor and Outdoor Use
Buy at Amazon for €36.99
As of 2020-05-27 08:55
prices & availability might be subject to change.
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Battery Helpers

Battery Calibration

2020-05-14

Probably one of the most persistent Battery Myths: the battery needs to be calibrated every now and then! Rather nonsense (see linked article). You don't need an app to calibrate your device's battery. That rather happens as a side-effect: that is, always when your battery ran low until the evening, and you fully charged it in one uninterrupted run (over night) – so those apps are mostly „snake oil“ to obtain ad revenue (see: What’s it all about those modules apps contain?). But for those who insist, there are some calibration apps available – which all require root (mostly to remove the batterystats.bin which holds the "juice consumed by app" data):

Identify Battery Consumers

2020-05-14

Though Android comes with a built-in tool to show battery usage and consumers, this is often mis-interpreted and not even complete. It gives you raw indicators, true – and if there's an app nibbling at your battery all day long permanently with „greater hunger“, it will certainly show up here. For a deeper analysis, however, one often needs tools revealing more details:

Other Battery Helpers

2020-05-14

Further Readings:

2020-05-27