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Some Android phones have removable batteries, and others are non-removable. It is the battery capacity that makes the device alive for hours. Also, the device can be used while charging.

For an Android device with removable battery, is it possible to use only in charging mode (wall charging with the device's charger/USB charging) after removing its battery?

(For example, a laptop can be run by direct plugging, without battery)

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    I would say that this depends on the phone. Many phones have rather small and simple charging circuits that don't support bypassing the battery when it is full. Sometimes this logic is even offloaded to the battery (Lithium-Ion batteries often have their own charging controllers). Keep in mind that a charger might not provide enough or enough stable power like a battery would, so that could cause your idea to fail, as well. – GiantTree May 15 '17 at 7:06
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    In my usage history of 80+ smart devices (granted, some not Android, many not with removable batteries), I have yet to see one single device that's capable of doing this by default... – Andy Yan May 15 '17 at 8:06
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    Yes, some phones do work without a battery. I have an old LG that i just connect to a USB cable and it works just fine. – Douglas Hosea May 15 '17 at 9:52
  • I could swear that my old Galaxy S II did allow this.... – Liam W May 30 '17 at 16:36
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AFAIK, no.

The fundamental reason is usage and the design that evolved based on it- mobile phone, as the name suggests, is meant to be used whenever and wherever, with periodic charging, unlike laptops, which are designed to work with/without being plugged into power.

It seems technically possible to work without a battery if you build an electric circuit that simulates a battery in all respects (including the battery health pin which is usually the third pin on battery) as you can see here. Whether such a circuit will work across OS versions and devices is not certain.

Android considers battery to be an integral part of the system rather than an accessory and OS evolves in safety, the longevity of the battery, user-friendly features, that support this - witness Battery Saver, automatic shutdown at low battery percentage as examples. If the electronics (SMBus) detects that it is not an actual battery source, this circuit may fail

Views expressed in comments are valid pointers, in addition to mine

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My Infinix Hot 4 battery exploded and was left without one at home. I did this by drawing a circuit with a pencil on the motherboard from the GND pin to -ve pin. This tricked the phone that it has a battery on and it boots normally without one.

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