Yushi YUT-2600 Replacement Battery 10.8V 6600mAh

Yushi YUT-2600 / YUT-2800 Series — 10.8V Li-ion Replacement Battery

This is a 10.8V, 6600mAh (71.28Wh) Li-ion replacement battery for Yushi YUT-2600, YUT-2620, YUT-2800, and YUT-2820 notebooks. It slots into the same bay as the original cell and connects to the same charge circuit. Capacity is drawn from the product specification — not estimated.

• YUT-2600 and YUT-2800 series compatibility: All four models in this lineup share the same 10.8V three-cell series voltage rail, matching connector pinout, and BMS handshake protocol — which is why a single replacement cell covers the full range without any wiring or firmware difference.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a YUT-2600 platform, confirmed the BMS handshake completed on first connection, and verified charge termination triggered correctly at 12.6V — no overcharge events detected.
• BIOS learn cycle after install: After fitting this cell, run a full discharge to the hibernate cutoff point, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.

Why the YUT-2600 reports poor battery health immediately after fitting a new cell

The BIOS reads EEPROM data stored in the battery's fuel gauge IC — not the actual cell voltage. When a new cell arrives, that EEPROM holds factory default values that don't match any learned discharge curve, so the BIOS flags it as degraded. The fix is not a hardware fault. One full discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh calibration data to the IC and resolves the health warning. After two to three complete cycles, the reported capacity will stabilise to reflect the actual 6600mAh rating.

Laptop cuts off abruptly while the OS still shows 20–25% charge remaining

This is a voltage cliff failure — under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track, and the protection circuit trips before the displayed percentage reaches zero. It is most visible on the YUT-2600 when running heavy tasks straight after a battery swap, before the fuel gauge has been calibrated. The gauge IC needs at least two full discharge-to-charge cycles to map the new cell's voltage-to-capacity curve accurately. Run two complete cycles from 100% down to hibernate cutoff, and the early shutdowns will stop.