About this replacement
Lenovo 10W-82ST Tablet — 7.68V Li-Polymer Replacement Battery (L21D2PG1)
This 7.68V, 3750mAh (28.8Wh) Li-Polymer battery replaces the original L21D2PG1 cell in the Lenovo 10W-82ST tablet. It fits the full 82ST model range, including regional variants 82ST0000JP, 82ST0001CC, and 82ST0001CF, among others. Compatible OEM part numbers also include 5B11F38381, L21C2PG1, L21L2PG1, and L21M2PG1.
- 82ST variant compatibility: All 82ST models share the same battery bay dimensions (188.90 × 84.35 × 4.40mm), connector pinout, and BMS handshake protocol. The cell voltage rail at 7.68V is consistent across every regional SKU, so one part number covers the full production run.
- Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS communication checks. The protection circuit responded correctly to over-current and low-voltage cutoff thresholds, and the fuel gauge IC initialised without error flags.
- Post-install calibration on the 10W tablet: After fitting this cell, run one full discharge until the tablet hibernates at cutoff voltage, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the 10W-82ST shuts down at 20–30% after a battery swap
The fuel gauge IC on the 82ST builds its discharge curve against the original cell's EEPROM data. When a new cell goes in, that stored curve no longer matches the actual chemistry, so the gauge miscalculates remaining capacity. Under combined CPU and display load, the tablet hits what looks like 20–30% on screen but is actually the cell's real voltage floor. Running two to three full charge-discharge cycles recalibrates the gauge against the new cell and the premature shutdowns stop.
BIOS reporting battery health as poor or unknown immediately after fitting
This is an EEPROM mismatch, not a fault with the replacement cell. The BIOS reads health data written to the old cell's EEPROM and compares it against the new cell's output — the values don't align, so it flags a warning. Boot into the Lenovo Vantage app or the BIOS power settings and run the battery gauge reset function. After one full learn cycle, the BIOS reads the new cell correctly and the health warning clears. If Vantage is not installed, a full discharge to hibernate cutoff followed by an uninterrupted charge to 100% achieves the same reset.