System76 Lemur Pro 10 Compatible Battery 7.7V 9300mAh

System76 Lemur Pro 9 & 10 — 7.7V Li-Polymer Replacement Battery

This is a 7.7V, 9300mAh (71.61Wh) lithium-polymer battery for the System76 Lemur Pro generations 9 and 10. Both generations share the same cell format, connector pinout, and BMS communication protocol, so one part covers both. It restores battery function when the original cell has degraded past usable capacity.

• Lemur Pro 9 and 10 compatibility: System76 carried the same 7.7V battery architecture across both generations — same physical footprint at 248 × 99.6 × 5.4mm, same connector, same BMS handshake over the EC interface. No hardware modification needed when moving between either generation.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Lemur Pro 10 board. The embedded controller recognised the battery, BMS communication cleared without fault codes, and the cell held voltage across the full discharge curve without premature cutoff.
• First-cycle recalibration on the Lemur Pro: After fitting, run the laptop on battery only until it hibernates at low charge, then charge uninterrupted to 100% without waking the machine mid-cycle. This forces the Lemur Pro's embedded controller to re-learn the new cell's capacity endpoints and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after fitting

The Lemur Pro's embedded controller stores learned capacity data from the previous cell in firmware. When a new cell installs, that stored data no longer matches the actual chemistry, so the EC flags it as degraded before any learning occurs. This is not a fault with the replacement cell. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge to 100%. After one full learn cycle, the EC updates its baseline and the poor-health flag clears.

Laptop shuts down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC's stored discharge curve doesn't match the new cell's actual voltage-versus-capacity profile. The gauge reads 25% while the cell has already hit the low-voltage cutoff under CPU and display load combined. The BMS correctly protects the cell — the gauge is simply miscalibrated. Run two to three full discharge-to-hibernate then charge-to-100% cycles and the fuel gauge IC will remap its curve to the new cell, pushing the reported shutdown point below 5%.