Wortmann Terra Mobile 1715 14.4V Replacement Battery 2200mAh

Wortmann Terra Mobile 1715 (1220618) — 14.4V Li-ion Replacement Battery

This is a 14.4V, 2200mAh (31.68Wh) Li-ion battery for the Wortmann Terra Mobile 1715 (1220618) laptop. It also fits the Terra Mobile 1515 (1220550), Terra Mobile 1715V (1220597), Terra Mobile 1515 (N750BU), and 27 additional Terra Mobile variants sharing the same voltage rail and connector. Capacity figures come from product data — not inflated web claims.

• Terra Mobile 1515 and 1715 platform fit: These models share a common 14.4V battery bay specification, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers the full range. Swapping between sub-models in this family does not require firmware changes.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a Terra Mobile unit. The BMS engaged correctly at both ends — top-of-charge cutoff held at 16.8V and low-voltage protection tripped before cell damage, with no false trips under typical CPU and display load.
• First-cycle calibration on Terra Mobile units: After fitting this cell, run the laptop on battery until it hibernates at low charge, 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 on Terra Mobile hardware.

BIOS reporting poor battery health immediately after fitting a new cell

The Terra Mobile BIOS reads health data from EEPROM registers that carry over from the old cell — not from the new chemistry. A fresh cell scores "poor" because the stored cycle count and degradation figures belong to the original battery. This is not a fault with the replacement. One full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the learn cycle and rewrites those EEPROM values against the new cell's actual behaviour.

Laptop shuts down at 20–30% charge shown on screen

This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. When the new cell hits the voltage cliff under combined CPU and display load, actual cell voltage drops faster than the gauge predicts — so the BIOS trips a protective shutdown before the displayed percentage reaches zero. The fix is the same calibration cycle: drain to hibernate cutoff, charge fully to 100% without interruption. After two to three cycles the gauge IC tracks the new cell accurately and the early shutdown stops.