ONN 100044018G Tablet Compatible Battery 3.85V 4300mAh

ONN 100044018G / 100044018p 8" Kids Tablet — 3.85V Li-Polymer Replacement Battery (U31100103PV)

This is a 3.85V, 4300mAh Li-Polymer replacement battery for the ONN 100044018G, 100044018p, and 8" Kids tablet. It matches the original U31100103PV specification and fits inside the same battery cavity with the same connector. Install this when the original cell no longer holds adequate charge for daily use.

• 100044018G, 100044018p, and 8" Kids compatibility: These three models share the same 3.85V battery rail, identical physical envelope, and matching connector pinout — all three pull from the same OEM cell specification, so one part number covers all.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the 100044018G. The charge IC accepted the cell without fault flags, and the BMS held voltage within spec across the discharge curve with no premature cutoff.
• Fuel gauge recalibration after swap: After installation, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using the device. This forces the fuel gauge IC to map its thresholds against the new cell and clears the inaccurate percentage readings that appear immediately after a battery replacement.

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

This happens because the fuel gauge IC still holds calibration data from the degraded original cell. When the display backlight and Wi-Fi radio pull current simultaneously, voltage sags briefly below the IC's stored low-voltage threshold — and it triggers an early shutdown even though usable capacity remains. The fix is one full recalibration cycle: discharge to automatic shutoff, then charge to 100% uninterrupted. After that single cycle, the IC recalculates its cutoff reference against the new cell and shutdowns at 15–25% stop occurring.

Fast charging not available after replacing the battery

Some ONN tablets require at least one completed charge cycle before the charge IC enables fast charge negotiation on a new cell. On a fresh cell, the charge controller may default to standard current until it confirms stable voltage behaviour across a full cycle. Plug into the original ONN charger — not a third-party cable — and let the tablet charge fully from below 10% without interruption. Fast charge typically becomes available from the next charge session onward once the cycle is logged.