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– With stock, I was lucky to get through a full day. Now I’m easily getting 30–40% more screen-on time. The custom firmware strips out all the background telemetry and useless services. Standby drain is almost nonexistent.
Because there is no single "official" custom firmware (like RetroArch or Rockbox) made specifically for the X12 Plus, the "custom firmware" scene for this device typically involves installing or RetroArch forwarders that replace the stock menu system. X12 Plus Custom Firmware
Usually Easy PC or the Multimedia Product Tool . – With stock, I was lucky to get through a full day