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Das inoffizielle Android-SystemhandbuchDas inoffizielle Android-Systemhandbuch
Buy at Amazon for €6.99
Samsung Galaxy Tab S7 Android Tablet with Stylus, WiFi, 3 CamerasSamsung Galaxy Tab S7 Android Tablet with Stylus, WiFi, 3 Cameras
Buy at Amazon for €1,078.62
OUKITEL WP5 Pro Outdoor Mobile Phone, 4G Dual SIM Outdoor Smartphone Without Contract, IP68 Waterproof, 8000 mAh Battery, 4GB + 64GB, Android 10 Mobile Phone Global Version 5.5 Inch Triple Camera, Face/Fingerprint ID, BlackOUKITEL WP5 Pro Outdoor Mobile Phone, 4G Dual SIM Outdoor Smartphone Without Contract, IP68 Waterproof, 8000 mAh Battery, 4GB + 64GB, Android 10 Mobile Phone Global Version 5.5 Inch Triple Camera, Face/Fingerprint ID, Black
Buy at Amazon for €169.99
Samsung Galaxy S20 FE, Android SIM Free Smartphone, 6.5 Inch Super AMOLED Display, 4500 mAh Battery, 256 GB/8 GB RAM, Smartphone in Cloud NavySamsung Galaxy S20 FE, Android SIM Free Smartphone, 6.5 Inch Super AMOLED Display, 4500 mAh Battery, 256 GB/8 GB RAM, Smartphone in Cloud Navy
Buy at Amazon for €607.50
Nebula Capsule Projector by Anker, Smart Portable Projector with Wi-Fi Pico, 100 ANSI Lumen, DLP, 360 Degree Speaker, 2.5 Metre Screen for Android 7.1 4 Hours Battery Life with AppNebula Capsule Projector by Anker, Smart Portable Projector with Wi-Fi Pico, 100 ANSI Lumen, DLP, 360 Degree Speaker, 2.5 Metre Screen for Android 7.1 4 Hours Battery Life with App
Buy at Amazon for €349.99
Smartphone without contract KXD 6A Cheap 3G Android Smartphone 5.5 Inch Full Screen 8GB ROM (64GB Expandable) Face ID 2500 mAh Battery 5MP Cameras Dual SIM, Quad Core, Global Version RedSmartphone without contract KXD 6A Cheap 3G Android Smartphone 5.5 Inch Full Screen 8GB ROM (64GB Expandable) Face ID 2500 mAh Battery 5MP Cameras Dual SIM, Quad Core, Global Version Red
Buy at Amazon for €63.99
Ulefone Armor X5 Outdoor Mobile PhoneUlefone Armor X5 Outdoor Mobile Phone
Buy at Amazon for €144.99
As of 2021-07-25 00:07
prices & availability might be subject to change.
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Battery Helpers

Battery Calibration

2021-07-19

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

2021-07-19

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

2021-07-19

Further Readings:

2021-07-21