Olivetti Xtrema 423S Compatible Battery 10.8V 6600mAh

Olivetti Xtrema 423S ME202BB — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V Li-ion battery rated at 6600mAh (71.28Wh), built to replace the original DR202 cell in the Olivetti Xtrema 423S ME202BB notebook. It fits into the same bay and connects via the same multi-pin connector as the factory pack. Cross-reference part numbers include EMC36, ME202BB, NL2020, and SMP02.

• Xtrema 423S platform fit: These part numbers share the same 10.8V three-cell-series configuration, connector pinout, and BMS handshake protocol — so the BIOS recognises the replacement pack the same way it recognised the original.
• Bench tested on actual hardware: We cycled this pack through charge, full discharge to cutoff, and a second charge pass while monitoring BMS communication. The protection circuit held charge termination correctly and did not trigger premature cutoff under simulated CPU and display load.
• Post-install calibration on the Xtrema 423S: After fitting this battery, 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 after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting the DR202

The Xtrema 423S BIOS reads health data stored in the old cell's EEPROM before any calibration has occurred on the new pack. The replacement cell arrives with default EEPROM values that do not match the laptop's stored charge history, so the BIOS flags it as degraded. This is not a fault with the battery. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge to 100% — after that cycle, the BIOS rewrites its battery learn data against the new cell's actual chemistry.

Olivetti Xtrema 423S shutting down at around 20–30% charge shown

This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The gauge underestimates remaining capacity, and when reported voltage drops below the BIOS low-battery threshold — typically around 10.0V under load — the laptop forces a shutdown even though the display still shows charge remaining. Run two full discharge-to-cutoff cycles back-to-back without interrupting the charge phase. After two cycles the fuel gauge IC anchors its empty-point correctly and shutdowns at false percentages stop.