About this replacement
Lenovo Chromebook N21 Series — 11.1V Li-Polymer Replacement Battery (L14C3P60)
This 11.1V, 3200mAh (35.52Wh) Li-Polymer battery replaces the original cell in the Lenovo Chromebook N21 and N21-80MG. It matches OEM part numbers L14C3P60, 5B10H45092, 5B10H33230, 5B10K10155, and L14M3P23. If your N21 no longer holds a charge or the OS flags a battery fault, this is the direct replacement.
- N21 and N21-80MG fitment: Both variants share the same 11.1V three-cell architecture, connector pinout, and BMS handshake protocol. One battery covers both SKUs without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the N21 platform. The BMS communicated correctly with ChromeOS, reported accurate state-of-charge, and held voltage within spec through the full discharge curve.
- Post-install discharge cycle on the N21: After fitting, run the Chromebook down to automatic hibernate cutoff, then charge uninterrupted to 100%. This triggers the BIOS battery learn cycle and clears the inaccurate health warning that appears in ChromeOS after any cell swap.
ChromeOS reporting battery health as poor immediately after swap
The Lenovo N21's BIOS carries EEPROM data from the original cell, including its accumulated wear history. When a new cell is installed, that stored data no longer matches actual battery state, so ChromeOS flags poor health before any real degradation has occurred. Running one full discharge-to-hibernate then a clean charge to 100% resets the learn cycle. After two to three calibration cycles, the health indicator reflects the new cell accurately.
N21 shuts down abruptly with 20–30% charge still showing
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge loses track of real state-of-charge under CPU and display load, reads too high, then the cell hits its low-voltage cutoff without warning. It is not a fault with the replacement cell. Run two full discharge-to-hibernate and charge-to-100% cycles — by the third cycle, the gauge IC recalibrates and the percentage reading stabilises against real cell voltage.