About this replacement
Lenovo ThinkPad X1 Carbon 2016 — 15.2V Li-Polymer Replacement Battery (00HW028)
This 15.2V, 3300mAh (50.16Wh) lithium-polymer battery replaces the original cell in the ThinkPad X1 Carbon 2016 and related X1 Carbon and X1 Yoga variants. It matches the OEM voltage rail and connector used across the 2016 generation ultrabook chassis. Drop-in fitment requires no tools beyond the base panel screws.
- X1 Carbon and X1 Yoga 2016 platform fit: These models share the same 15.2V four-cell Li-Polymer architecture, battery connector pinout, and BMS handshake protocol — which is why a single cell covers both the Carbon and Yoga variants from this generation.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ThinkPad X1 Carbon 2016 unit. The BMS handshake completed without fault codes, charge current tapered correctly at capacity, and the BIOS recognised the cell without a firmware warning on a post-cycle learn pass.
- BIOS learn cycle after installation: 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 on ThinkPad X1 hardware.
BIOS reporting battery health as poor after replacement
The ThinkPad BIOS reads health data from the battery's EEPROM, which stores charge history and cycle count from the previous cell. A new cell arrives with a blank or mismatched EEPROM state, so the BIOS flags it as degraded even though the cell is new. This is not a fault with the replacement — it's a firmware calibration issue. Running the full discharge-to-cutoff and uninterrupted recharge cycle described above writes fresh data to the learn register and resolves the warning.
Laptop shuts 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 displayed percentage is based on the old cell's profile, so the laptop hits the low-voltage cutoff threshold while the gauge still reads 20–30%. After two to three full discharge-and-charge cycles, the fuel gauge IC re-maps its readings to the new cell. If shutdowns persist after three cycles, check that the resting cell voltage reads above 15.0V before starting a charge cycle.