C76ML battery drain

Hello I have a BOOX C97ML,
Android 4.2.2
Kernel 3.0.36+
Firmware 1.8.2 2018
it has a 3000 mah battery and 8 gb. its a rebranded onyx by an Argentinian company.

The problem I have it´s that it drains my battey in stand by, and won´t last ore than 2 days even if I don´t use it.
Any Ideas?

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