Please imagine a car situation where you have an Android tablet:


And the following working rules (as expected in most cases):

  • If the car is OFF, tablet is OFF;
  • If the car is ON, tablet is ON (automatically);

I have been reading about enabling auto power on mode when the charger is connected: most tablets have the playlpm, lpm, or a specific file that displays the battery charging animation. The trick is to overwrite these files and force a boot.

Furthermore, I have also checked and tested Tasker, where I was able to achieve this behavior only when USB is connected.

However, I would like to know if there's anyway we can do it if the tablet has no battery attached on it.

Would this same approach work?

  • 2
    I'm aware of phones (Chinese mainly) that doesn't power on (connected to power source) unless battery is plugged in. They don't show any animation, LED blink or any vibration at all in such state; that doesn't mean they don't detect the source since I flashed one of them in such state. IDK maybe firmware has something to do here. Can't say about tablets though.
    – Firelord
    Commented May 20, 2015 at 15:10

2 Answers 2


I managed to solve this situation only by removing the battery.

Turns out that most tablet's automatically power on when they're directly connected to an external power source.


Solved simply by removing battery and shorting power button on lenovo a2020

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