About this replacement
Acer Iconia One 7 B1-750 — 3.8V Li-Polymer Replacement Battery (AP14E4K)
This 3.8V, 3400mAh lithium-polymer battery replaces the AP14E4K cell in the Acer Iconia One 7 B1-750 tablet. It fits the 7-inch Android tablet directly, restoring power to the display, processor, and radios. Dimensions are 94.55 × 85.70 × 3.20mm — confirm clearance before installation if your unit has any aftermarket internals.
- B1-750 fit confirmation: The B1-750 uses a single-cell Li-Polymer pack rated at 3.8V nominal. OEM part numbers AP14E4K, KT.0010G.007, KT.00104.001, AP14E8K, and KT00104001 all cross-reference to this cell configuration and connector pinout.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the B1-750 board. The charge IC accepted the new cell without fault flags, and the BMS communicated state-of-charge data correctly to the OS after a calibration cycle.
- Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff — do not manually power it off — then charge uninterrupted to 100%. This gives the fuel gauge IC a full-range reference against the new cell and clears the inaccurate percentage readings that appear immediately after a swap.
Tablet shutting down at 15–25% remaining on the B1-750
This happens when the display backlight and active WiFi pull current simultaneously, causing a brief voltage sag at the cell terminals. If the fuel gauge IC was calibrated to an aged cell, it maps this sag to a much lower state-of-charge than the new cell actually holds. The BMS then triggers a protection cutoff before the cell is genuinely depleted. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the reference table and eliminates these premature shutdowns.
B1-750 showing wrong battery percentage after replacement
The fuel gauge IC on the B1-750 board stores a charge map built around the original cell's internal resistance and capacity curve. A new cell has different characteristics, so the reported percentage drifts — often reading 80% when the cell is nearly full, or jumping from 40% to 10% with no warning. This is a calibration issue, not a faulty battery. Force one complete cycle: discharge to automatic shutoff, then charge uninterrupted to 100% with the screen off. After that single cycle the gauge tracks within a few percent.