DigiLand Quad Core 8" Replacement Battery 3.7V 4000mAh

DigiLand Quad Core 8" / DL8006 — 3.7V Li-Polymer Replacement Battery (PR-3797103)

This is a 3.7V, 4000mAh lithium-polymer replacement battery for the DigiLand Quad Core 8" tablet and DL8006. It slots into the same footprint as the original PR-3797103 cell and restores power to the display, processor, and wireless radios. Capacity figures are drawn directly from the product specification — 4000mAh / 14.8Wh.

• Quad Core 8" and DL8006 compatibility: Both models share the same charge IC, connector pinout, and BMS handshake protocol — the PR-3797103 part number covers either board revision without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a DL8006 board. The BMS accepted the cell, thermal cutoff triggered correctly at ceiling voltage, and the protection circuit opened cleanly at low-voltage cutoff.
• Post-swap fuel gauge reset: After fitting this battery, run the tablet down to automatic shutoff under normal use — screen on, Wi-Fi active — then charge uninterrupted to 100%. This gives the fuel gauge IC a full reference curve against the new cell and eliminates the inaccurate percentage readings that appear immediately after a swap.

Tablet shutting down at 15–25% remaining after battery replacement

The DigiLand's fuel gauge IC stores its discharge curve in memory calibrated to the old cell. When a new cell is fitted, the IC miscalculates the voltage-to-percentage relationship at the low end of the curve. The display and Wi-Fi radio together pull enough current to cause a voltage dip that the IC misreads as a dead cell — triggering shutdown well above true empty. Run one complete discharge to automatic shutoff followed by an uninterrupted charge to 100%. After that cycle the IC recalibrates and shutdown moves back to the correct low-voltage threshold near 3.4V per cell.

Battery percentage jumping or dropping faster than expected from 100%

Fuel gauge drift shows up as a percentage that drops sharply in the first 20% of use then slows, or reads 80% when the device actually has far less charge. The root cause is the same stored calibration curve — it no longer matches the real discharge profile of the new 4000mAh cell. A single full reference cycle — discharge to auto-shutoff, charge straight to 100% without interruption — writes a new baseline to the IC. If the reading still drifts after two full cycles, check that the charge voltage at the connector is reaching the expected 4.2V.