About this replacement
Pantech Element P4100 — 3.7V Li-Polymer Replacement Battery (PBR-43A)
This is a 3.7V, 5100mAh lithium-polymer replacement battery for the Pantech Element P4100 tablet. It matches the OEM PBR-43A specification and fits the original battery bay without modification. Replace it when the tablet no longer holds a charge or fails to power on from a depleted state.
- Element P4100 fitment: The P4100 uses a flat Li-Polymer cell with a proprietary connector and a fuel gauge IC that communicates charge state to the Android OS. This cell matches the correct physical dimensions (138.30 × 112.90 × 4.30mm), connector pinout, and voltage curve the tablet's charge controller expects.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the P4100 and confirmed the BMS handshake completes without fault codes. The charge IC accepted the cell and proceeded through standard CC/CV phases without interruption.
- Post-installation calibration cycle: After fitting this battery, run the tablet down to automatic shutoff — not a forced power-off — then charge it uninterrupted to 100%. This resets the fuel gauge IC against the new cell's actual capacity curve and eliminates the inaccurate percentage readings that typically appear after a swap.
Pantech Element P4100 shutting down at 15–25% remaining
This happens when the fuel gauge IC is still calibrated to the old, degraded cell's voltage curve. The new cell has a steeper voltage drop under combined display and WiFi load near the lower end of its charge range. The tablet's low-voltage protection trips earlier than the percentage display suggests. One full discharge-to-shutoff and uninterrupted recharge to 100% resets the calibration and pushes the actual cutoff below 10%.
Battery percentage jumping or reading incorrectly after swap
The P4100's fuel gauge IC stored discharge curve data from the original cell. A new cell with a different internal resistance profile causes the reported percentage to drift — often reading 30% while the tablet still has significant charge remaining, or jumping from 60% to 100% instantly on reconnect. This is not a fault with the replacement cell. Run one complete discharge cycle to automatic shutoff, then charge uninterrupted to 100% at 3.7V nominal — the gauge IC will map its reference points against the new cell and stabilise.