About this replacement
Lenovo Tab 7 TB-7504F / TB-7504X — 3.8V Li-Polymer Replacement Battery (L16D1P33)
This is a 3.8V, 3400mAh lithium-polymer battery for the Lenovo Tab 7, fitting both the TB-7504F and TB-7504X variants. It replaces OEM part L16D1P33. If your tablet no longer holds a charge or shuts down unexpectedly, this cell restores normal operation.
- TB-7504F and TB-7504X compatibility: Both tablet variants run the same 3.8V power rail and use an identical connector and BMS handshake, so one cell covers the full Tab 7 range without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the TB-7504 platform and confirmed the BMS communicated correctly with the charge IC — no fault flags, no cutoff errors during normal load.
- Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% before using it again. This resets the fuel gauge IC calibration against the new cell and clears the inaccurate percentage readings that commonly appear right after a replacement.
Lenovo Tab 7 shutting down at 15–25% remaining
This happens because the fuel gauge IC was calibrated to the old, degraded cell. When the original cell aged, its voltage curve flattened at low charge levels — and the gauge learned that curve. With a new cell installed, the voltage drops more steeply at the same state of charge, and the tablet's low-voltage protection trips before the gauge catches up. Run one full discharge to automatic shutoff followed by an uninterrupted charge to 100%. After that single cycle, the gauge relearns the new cell's curve and the premature shutdowns stop.
Fast charging not available after battery swap on Tab 7
Some users report that fast charging stops working immediately after a replacement. The charge IC needs at least one completed charge cycle on the new cell before it re-negotiates the higher current draw with the charger. Use the original Lenovo charger and cable — third-party cables with high resistance can prevent the handshake from completing. After one full charge cycle from near-empty to 100%, fast charge availability typically returns without any further steps.