Location of battery animation file on a Chinese tablet I'm working with a Chinese tablet. I need to turn on the tablet when it is attached to an external power source.

I'm looking for the equivalent file of playlpm that you usually find on Samsung devices.

Are there any names for Chinese brands?
Provided you have adb access as root while in recovery, you can adb pull the *.rc files from recovery's ramdisk and search the entry or similar to

on charger


to see what the equivalent service is.
Or ,again, while in adb shell in recovery,

cat /init.rc


which is where the entry for charger/on charger functions should be.
The battery animation resources will be in /data/media OR (while in recovery) /res/images/

As to the boot on charger plugin, if you don't have your own approach sorted see my answer to a similar question.

Look for the service under the on charger section that runs as per on charger, Using the Samsung example, reassign lpm service under on charger as reboot, You can't achieve an instant boot up on plugin, it just doesn't work, so you tell the device that on being plugged in it will reboot to normal operation INSTEAD of beginning it's on charger defined service.
Here is the Samsung example;

From,

service lpm /system/bin/lpm
    class charger
    critical


To,

service lpm /system/bin/reboot
    class charger
    critical


Find the equivalent service for your device and make that modification.
Redefining service classes can lead you into a minefield of problems.
Or you just won't boot. You do need to be rooted and so be able to dump,unpack,modify,repack and, rewrite your boot.img