About this replacement
Lenovo IdeaPad 100S-14IBR — 7.6V Li-Polymer Replacement Battery (0813002)
This is a 7.6V, 4100mAh (31.16Wh) Li-Polymer battery for the Lenovo IdeaPad 100S-14IBR 14-inch notebook. It replaces OEM part numbers 0813002, 5B10K65026, and NC140BW1-2S1P. Fit covers the 80R9 series variants, including the 80R9002WGE and 80R90031PH builds.
- IdeaPad 100S-14IBR 80R9 series compatibility: All 80R9 variants share the same 7.6V two-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol. Swapping between sub-models carries no electrical risk — the BMS negotiation is identical across the full 80R9 range.
- Bench tested on actual hardware: We cycled this cell through charge, discharge, and suspend-resume on an IdeaPad 100S-14IBR unit. The BMS accepted the cell without fault codes, and charge current ramped normally from bulk to trickle at the correct voltage threshold.
- Post-install recalibration step: After fitting, run the laptop down to hibernate cutoff on battery only, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after replacement
The IdeaPad 100S-14IBR stores battery health data in EEPROM on the old cell. When a new cell goes in, the BIOS reads stale EEPROM values and flags the battery as degraded before it has run a single cycle. This is a data mismatch, not a cell fault. Running one full discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle. After two to three full cycles, the BIOS recalculates health against real cell data and the warning clears.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 25% remaining, but the cell voltage has already dropped below the minimum load threshold under combined CPU and display draw. The laptop shuts down to protect the cell — not because the battery is faulty. Run two full discharge-to-hibernate cycles without interruption. After calibration, the fuel gauge tracks the real voltage cliff and the OS percentage reading aligns with actual charge state.