About this replacement
Lenovo IdeaPad 1-11ADA05 / 1-14ADA05 — 7.5V Li-Polymer Replacement Battery (L19M2PF0)
This is a 7.5V, 4500mAh (33.75Wh) Li-Polymer cell for the Lenovo IdeaPad 1-11ADA05 (82GV) and IdeaPad 1-14ADA05 (82GW) series notebooks. It replaces OEM part numbers L19M2PF0, 5B10W67171, SB10V25256, SB10V25257, and SB10W67317. It restores portable operation when the original cell no longer holds a usable charge.
- IdeaPad 1 11-inch and 14-inch compatibility: Both the 82GV and 82GW chassis share the same connector pinout, BMS handshake protocol, and 7.5V two-cell Li-Polymer architecture — one cell covers both screen sizes.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the IdeaPad 1 platform. The BMS communicated correctly with the EC, charge termination triggered at the expected voltage ceiling, and protection circuits tripped normally under over-discharge simulation.
- Post-install calibration step: After fitting this cell, run the laptop down to hibernate cutoff under normal use, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The IdeaPad 1 EC reads cycle count, full-charge capacity, and design capacity from EEPROM data embedded in the original cell. When a new cell goes in, the stored figures no longer match the live chemistry, so the BIOS flags health as degraded or unknown — not a fault with the replacement. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%. The BIOS recalculates full-charge capacity against the new cell and clears the warning. If the warning persists after two complete cycles, check the EC firmware version in Lenovo Vantage.
Laptop shuts down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under combined CPU and display load the new cell's actual voltage curve doesn't match the stored model, so the system hits a hard voltage floor and cuts power before the displayed percentage reaches zero. The fix is a calibration cycle: let the laptop discharge under load — streaming video or a browser-heavy task works — all the way to automatic hibernate, then charge to 100% without interruption. After two to three of these cycles the fuel gauge IC recalibrates to the new cell and the shutdowns stop. Target a resting voltage of 8.4V at full charge to confirm the cell seated correctly.