About this replacement
Clevo 2820 / 2830 / 2850 — 14.8V Li-ion Replacement Battery (XLB0034)
This is a 14.8V, 3600mAh (53.28Wh) lithium-ion battery for the Clevo 2820, 2830, and 2850 notebook series. It replaces OEM part number XLB0034. If your original cell no longer holds charge or the laptop drops off battery immediately, this is the direct swap.
- 2820, 2830, and 2850 compatibility: All three models share the same 14.8V four-cell architecture, the same connector pinout, and the same BMS handshake protocol — which is why a single cell covers the whole group without modification.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication checks. The protection circuit responded correctly to over-voltage and under-voltage thresholds, and the pack reported state-of-charge cleanly to the host system.
- Post-install calibration on Clevo notebooks: After fitting this cell, run the laptop down to hibernate-cutoff on battery only, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The Clevo BIOS stores battery health data in EEPROM and compares it against the previous cell's charge history. When a new cell goes in, the EEPROM data no longer matches the actual chemistry, so the system flags the battery as degraded before it has ever cycled. This is a firmware read error, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn cycle and resolves the warning.
Laptop shuts down hard 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 gauge still maps percentage readings to the old cell's profile, so what shows as 25% is already at or below the BMS low-voltage cutoff — typically around 10.8V for a four-cell 14.8V pack. The BMS triggers a hard shutdown to protect the cells before the OS can log the event. Complete two full discharge-and-charge cycles to let the fuel gauge IC resample the new cell's curve and restore accurate percentage readings.