About this replacement
Lenovo ThinkPad Edge E43A / K43 Series — 11.1V Li-ion Replacement Battery (L08M6D22)
This 11.1V Li-ion battery carries a 4400mAh (48.84Wh) capacity and fits the Lenovo ThinkPad Edge E43A, E43G, E43L, and K43 series notebooks. It replaces OEM part numbers L08M6D22, L08M6D23, L08M6D24, and 121000675. The cell slots into the standard ThinkPad Edge bay with no modification.
- ThinkPad Edge E43 and K43 platform fit: These models share the same 11.1V three-cell architecture, connector pinout, and BMS communication protocol — one cell covers the entire lineup without electrical modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the E43 platform. The BMS handshook correctly with the BIOS on first boot, and charge acceptance held stable across the full voltage range from cutoff to 12.6V.
- Post-install discharge cycle on ThinkPad Edge: After fitting this cell, run one full discharge to hibernate-cutoff, 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 ThinkPad BIOS stores learned capacity data from the previous cell in EEPROM. When a new cell goes in, that stored data no longer matches the actual cell chemistry, and the BIOS flags a health warning. This is not a fault with the replacement cell. Running a single full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its learned values. After one or two complete cycles, the health status clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the cell voltage drops below the BIOS cutoff threshold under combined CPU and display load before the fuel gauge reaches zero. The fuel gauge IC is reading state-of-charge from a calibration table that no longer matches the new cell. The cell hits a voltage cliff under load — typically below 10.8V — while the gauge still shows capacity remaining. Run two full discharge-to-hibernate and recharge cycles to let the fuel gauge IC recalibrate against the new cell's actual discharge curve.