About this replacement
Boyue Likebook Mars 7.8" — 3.7V Li-Polymer Replacement Battery (CLP307499)
This 3.7V, 2300mAh Li-Polymer cell replaces the factory battery in the Boyue Likebook Mars 7.8" e-reader. It matches the original CLP307499 spec and fits the same connector and housing. Capacity figure is taken directly from product data — 8.51Wh total energy.
- Likebook Mars 7.8" fitment: The Likebook Mars uses a slim LiPo pouch cell sitting beneath the e-ink panel. This cell matches the original 95.80 × 69.70 × 3.00mm footprint and the same JST-style connector, so the BMS on the mainboard recognises it without renegotiation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an e-reader mainboard. The BMS accepted the cell at initial connection, completed a full charge without tripping over-voltage protection, and reported state-of-charge correctly across the discharge curve.
- Post-swap charging protocol for the Likebook Mars: The Likebook Mars firmware recalibrates its fuel gauge on the first full charge cycle after a cell swap. Skip that cycle and the battery percentage display will read inaccurately for weeks. Charge to 100% via USB before the first read session.
Why the Likebook Mars won't boot after a battery swap
LiPo cells in storage discharge slowly. If this cell has been sitting in a warehouse, its resting voltage may be below the 3.0V minimum the Likebook Mars bootloader needs to initialise. The device will appear completely dead — no logo, no screen flicker. Plug in the USB charger and leave it connected for at least 10 minutes before pressing the power button. At that point the cell should be above boot threshold and the device will start normally.
Battery percentage jumping around in the first few days after installation
This is a fuel gauge calibration issue, not a faulty cell. The Likebook Mars tracks battery state using a coulomb counter that was tuned to the original cell's charge curve. A new cell resets that baseline. The percentage readout stabilises after one or two complete charge-discharge cycles. Run the device down to below 10% from a full charge twice, and the firmware will lock onto the new cell's actual capacity curve.