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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.

My question is that,

For an android device with removable battery, Is it possible to use an android phone only in charging mode (wall charging by 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
  • Very good question, at one time had a similar question in my mind, but couldn't find substantive information on this! – xavier_fakerat May 15 '17 at 9:30
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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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NO AFAIK

Fundamental reason is usage and the design that evolved based on it- mobile phone as the name suggests are meant to be used whenever and wherever, with periodic charging, unlike laptops, which are designed to work with / without being plugged in to 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, longevity of battery, user friendly features, that support this - witness Battery Saver , automatic shut down 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 batteryexploded and was left without 1 at home. i did this i drew a circuit with a pencil on the mother board from gnd pin to -ve pin this tricked the phone it had a battery on and it boots normally without one.

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