About this replacement
Dell Vostro 1710 / 1720 — 14.8V Li-ion Replacement Battery (T117C)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion replacement battery for the Dell Vostro 1710 and Vostro 1720 laptops. It replaces OEM part numbers T117C, P721C, P722C, T118C, P726C, and associated Dell order codes including 312-0740, 312-0741, 451-10611, and 451-10612. Fit the battery, connect to AC, and let it charge before untethering the machine.
- Vostro 1710 and 1720 compatibility: Both models use the same 14.8V four-cell Li-ion architecture, identical connector pinout, and the same BMS handshake protocol — so one cell works across both chassis without modification.
- Bench tested on actual hardware: We ran this cell on a Vostro 1710 and confirmed the BMS negotiated correctly with the Dell EC, charge current ramped normally from CC to CV phase, and the cell reached full capacity without triggering a fault code.
- First-cycle calibration on the Vostro: After installing, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping cells in Dell notebooks.
BIOS reporting battery health as poor after installing a new cell
Dell's EC reads health data from the battery's EEPROM, which stores cycle count and state-of-health values written by the original cell. A fresh cell arrives with factory EEPROM values that the Dell BIOS may flag as mismatched or degraded. This is a data mismatch, not a fault with the replacement cell. Run one full discharge-to-hibernate then a full uninterrupted charge — the BIOS learn cycle overwrites the stale EEPROM interpretation and the health warning clears.
Laptop cuts out at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The old calibration data maps voltage to percentage using the worn cell's characteristics, so the gauge reads 25% while the cell voltage has already hit the BMS low-voltage cutoff. The system shuts down because the cell is genuinely flat — the percentage on screen is wrong, not the battery. Run two to three full discharge and charge cycles to let the fuel gauge IC re-anchor its curve to the new cell; after that, the shutdown threshold should align with a true low reading near 5–10%.