Dell Latitude 2100 11.1V Replacement Battery 00R271

Dell Latitude 2100 / 2110 / 2120 — 11.1V Li-ion Replacement Battery (00R271)

This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Dell Latitude 2100, 2110, and 2120 netbooks. It fits the same connector and BMS handshake as the OEM pack. Cross-references include 312-0142, F079N, G038N, and over two dozen Dell part numbers for this platform.

• Latitude 2100 series fit: The 2100, 2110, and 2120 share the same battery bay dimensions, 11.1V nominal rail, and SMBus BMS protocol. One cell fits all three without modification.
• Bench tested on actual hardware: We ran this cell on a Latitude 2110 unit. The BMS initialised correctly, charge acceptance was full to 4400mAh, and the SMBus reported accurate voltage and temperature data throughout the cycle.
• Post-swap BIOS learn cycle: After installing this battery, run the netbook down to the hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false health warning that appears when the firmware reads EEPROM data left over from the old cell.

BIOS reporting battery health as poor after a fresh cell swap

Dell's BIOS reads health data from the battery's EEPROM, which stores cycle count and wear flags written by the previous cell. A new cell arrives with a clean EEPROM, but the BIOS compares it against its stored baseline and flags a mismatch. This shows as "poor health" or a red battery icon in Dell's hardware diagnostics. Running one full discharge-to-hibernate then a full uninterrupted charge forces the BIOS to rewrite its baseline against the new cell's actual data.

Latitude 2100 shutting down unexpectedly at 20–30% charge shown

The fuel gauge IC calibrates its remaining-capacity estimate against the old cell's voltage curve. A new Li-ion cell holds voltage flatter across its discharge range, so the gauge underestimates how close the cell is to its minimum voltage floor. Under combined CPU and display load, the cell voltage drops sharply at the true end of charge — faster than the uncalibrated gauge expects — triggering an immediate shutdown. After two to three full discharge-to-hibernate and full-recharge cycles, the gauge IC recalibrates and the cutoff tracks accurately. At that point the shutdown should shift to below 5% shown.