About this replacement
Polaroid MIDB944PXE — 3.7V Li-Polymer Replacement Battery (AHB3275105)
This is a 3.7V, 3300mAh Li-Polymer battery replacing part number AHB3275105 in the Polaroid MIDB944PXE tablet. It matches the original cell's voltage, capacity, and connector footprint. Swap it in when the tablet no longer holds a charge or shuts down unexpectedly under load.
- MIDB944PXE fitment: The MIDB944PXE uses a single-cell 3.7V Li-Polymer pack with a specific connector pinout and BMS handshake. This replacement matches that configuration so the charge IC communicates correctly with the new cell from the first boot.
- Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the bench. The BMS accepted charge current without fault flags, and the protection circuit tripped correctly at low-voltage threshold — no runaway, no false cutoff.
- Fuel gauge reset after installation: After fitting the new cell, run the tablet down to automatic shutoff, then charge uninterrupted to 100% before use. This recalibrates the fuel gauge IC against the new cell and clears the inaccurate percentage readings that appear after a battery swap.
Tablet shutting down at 15–25% remaining after battery replacement
This happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. When the display and Wi-Fi draw current simultaneously, voltage sags faster than the gauge expects, and the OS calls a shutdown before the actual state of charge hits zero. The fix is a full recalibration cycle — discharge to automatic shutoff, then charge to 100% in one uninterrupted session. After that cycle, the gauge maps the new cell's voltage profile accurately and the early shutdowns stop.
Fast charging not available after fitting the new battery
Fast charge protocols on Android tablets require the charge IC to complete at least one accepted charge handshake with the new cell before enabling higher current draw. If the tablet reverts to slow charging after a swap, use the original Polaroid charger and cable for the first full cycle — third-party cables can fail USB-PD negotiation and lock the device to 5V standard charging. Once one full cycle completes with the correct charger, the fast charge mode should re-enable on subsequent sessions. If it does not, check the cable — not the battery.