Trigem TekBook 822 Replacement Battery DR202 10.8V 6600mAh

Trigem TekBook 822 — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V 6600mAh (71.28Wh) Li-ion replacement battery for the Trigem TekBook 822 notebook. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. If your original cell is degraded or dead, this restores untethered operation on that specific platform.

• TekBook 822 platform fit: The TekBook 822 uses a fixed connector layout and a BMS handshake tied to the 10.8V three-cell rail. This cell matches that voltage rail and connector pinout, so the laptop's charge controller recognises it without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a TekBook 822 platform. The BMS accepted the cell, the charge controller stepped through CC/CV correctly, and no protection-trip faults appeared during the test sequence.
• First-cycle reset after install: After fitting this cell, run the laptop down to hibernate cutoff — let it shut itself off. Then charge uninterrupted to 100% without unplugging early. This resets the BIOS battery learn cycle and clears the inaccurate health warning that typically appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting this cell

The TekBook 822 BIOS stores battery health data from the previous cell in its EEPROM. When a new cell goes in, that stale data doesn't clear automatically — the BIOS reads it and flags a health warning even though the cell is new. The fix is a full learn cycle: discharge to hibernate, then charge uninterrupted to 100%. After one or two full cycles, the BIOS recalibrates against the new cell's actual capacity data and the warning clears.

Laptop shuts off abruptly at 20–30% shown on the fuel gauge

The fuel gauge IC inside the TekBook 822 calibrates its discharge curve against the old cell's characteristics. With a new cell installed, the IC's stored curve doesn't match the new cell's actual voltage slope — so it misreads remaining capacity. When the laptop hits a CPU and display load spike, the actual cell voltage drops below the BMS cutoff threshold before the gauge reaches 0%. The gauge IC needs two to three full discharge-to-hibernate cycles to remap against the new cell. After those calibration cycles, the shutdown point corrects to below 5% shown.