About this replacement
Lenovo Legion 5 15 / Legion R7000 — 15.44V Li-Polymer Replacement Battery (5B10W86195)
This 15.44V, 3900mAh (60.22Wh) Li-Polymer cell replaces the original battery in the Lenovo Legion 5 15, Legion 5 15IMH05H, Legion R7000, and Legion R7000 2020. It fits units using OEM part numbers 5B10W86195, L19C4PC0, L19L4PC0, L19M4PC0, L19SPC0, SB10W86190, and SB10W86191. Install it when the factory cell no longer holds a usable charge or fails to power the laptop at all.
- Legion 5 15 and R7000 platform fit: Both the Legion 5 15IMH05H and R7000 2020 share the same 15.44V four-cell battery rail, connector pinout, and BMS handshake protocol — which is why a single part number covers the full range. Swapping a mismatched voltage cell here triggers an immediate BIOS charge-fault flag.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Legion 5 15 unit. The BMS negotiated correctly with the EC firmware, charge current stepped down at the expected 80% threshold, and the protection circuit tripped cleanly at the low-voltage cutoff without nuisance trips under simulated CPU plus GPU load spikes.
- Post-install calibration for Legion firmware: 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 in Lenovo Vantage following every cell swap.
BIOS reporting battery health as poor immediately after replacement
The Legion BIOS reads cycle count and health data stored in the old cell's EEPROM. A new cell ships with a fresh EEPROM — the firmware interprets the mismatch as a degraded or unknown battery and flags poor health in Lenovo Vantage. This is a firmware calibration issue, not a cell fault. Run the battery learn cycle: full discharge to hibernate shutdown, then a single uninterrupted charge to 100%. After one complete cycle the BIOS rewrites its reference data and the health warning clears.
Laptop shutting down at 20–30% charge shown on the gauge
The fuel gauge IC calibrates its state-of-charge map against the old cell's discharge curve. On a new cell, the IC underestimates remaining capacity and triggers a low-voltage shutdown while the gauge still reads above 20%. This is not a faulty cell — it is the gauge IC losing accuracy at the voltage cliff before recalibration. Force two full discharge-to-hibernate cycles followed by full uninterrupted charges. After those cycles the gauge IC re-maps its curve against the new cell chemistry and the premature shutdown stops. Confirm the cell is holding above 14.8V under load before ruling out a cell issue.