sunhux

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I'm looking for a Note 9 casing that comes with built-in battery<br />
which I can manually turn on/off charging the phone's built-in<br />
battery so tt it doesn't constantly charge the built-in phone battery<br />
<br />
There's no mention if the following models offer this feature:<br />
<a href="https://www.amazon.com/dp/B07GB5R27M/ref=psdc_7073958011_t1_B07H3256JB" rel="ugc">https://www.amazon.com/dp/B07GB5R27M/ref=psdc_7073958011_t1_B07H3256JB</a><br />
<a href="https://www.amazon.com/gp/product/B07H3256JB/ref=ox_sc_act_title_1?smid=A2QAZ8RQ4KWQ44&psc=1" rel="ugc">https://www.amazon.com/gp/product/B07H3256JB/ref=ox_sc_act_title_1?smid=A2QAZ8RQ4KWQ44&psc=1</a><br />
<a href="https://www.amazon.com/dp/B071NWVT9M/ref=psdc_7073958011_t2_B07H3256JB" rel="ugc">https://www.amazon.com/dp/B071NWVT9M/ref=psdc_7073958011_t2_B07H3256JB</a>
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I'm looking for a Note 9 casing that comes with built-in battery
which I can manually turn on/off charging the phone's built-in
battery so tt it doesn't constantly charge the built-in phone battery

There's no mention if the following models offer this feature:
https://www.amazon.com/dp/B07GB5R27M/ref=psdc_7073958011_t1_B07H3256JB
https://www.amazon.com/gp/product/B07H3256JB/ref=ox_sc_act_title_1?smid=A2QAZ8RQ4KWQ44&psc=1
https://www.amazon.com/dp/B071NWVT9M/ref=psdc_7073958011_t2_B07H3256JB

Note 9 casing with battery which can be turned off/on

Smartphones run using a variety of operating systems -- Android, iOS and Windows Mobile most commonly -- and an even wider variety of programming languages, including Objective-C, Java, Visual C#, C++ and .NET, not to mention HTML5 and JavaScript, and cross-platform frameworks such as PhoneGap.

Smartphone Programming

A smartphone or smart phone is a mobile phone with an advanced mobile operating system that combines features of a personal computer operating system with other features useful for mobile or handheld use. They typically combine the features of a cell phone with those of other popular mobile devices, such as personal digital assistant (PDA), media player and GPS navigation unit. Most smartphones can access the Internet, have a touchscreen user interface, can run third-party apps, music players and are camera phones. Most Smartphones produced from 2012 onwards also have high-speed mobile broadband 4G LTE internet, motion sensors, and mobile payment mechanisms.

Smartphones

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).