Gigaset GS80 Replacement Battery 3.7V 1600mAh

Gigaset GS80 — 3.7V Li-Polymer Replacement Battery (V30145-K1310-X469)

This is a 3.7V, 1600mAh Li-Polymer battery for the Gigaset GS80 smartphone. It replaces OEM part V30145-K1310-X469 directly. Fit the GS80 when the original cell no longer holds charge or causes unexpected shutdowns.

• GS80 cell compatibility: The GS80 uses a single-cell Li-Polymer pack at 3.7V nominal. The BMS inside the phone manages charge termination and low-voltage cutoff against that specific voltage rail. Swapping a cell outside that spec trips the charge IC and prevents the phone from powering on.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the GS80 platform. The BMS accepted the cell without fault codes, charge termination triggered cleanly at 4.2V, and the low-voltage cutoff engaged at the expected floor — no runaway charging observed.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The GS80's fuel gauge IC was calibrated to the old cell's discharge curve. Giving it one slow cycle before fast charging resumes lets the coulomb counter map the new cell accurately.

Why the GS80 reports wrong battery percentage after a cell swap

The GS80 uses a coulomb-counting fuel gauge IC that builds its charge model from previous cell data stored in memory. When you replace the cell, the IC still references the old discharge curve, so displayed percentage drifts from actual charge state. This shows up most visibly in the 40–70% range, where the old and new curves diverge most. One full discharge down to auto-shutdown followed by a complete charge to 100% at standard rate resets the learned curve and restores accurate reporting.

Sudden shutdown at 20–30% remaining on the GS80

This happens when the cell voltage drops below the BMS cutoff threshold under load — typically when the modem transmits or the screen peaks brightness — even though the fuel gauge still shows charge remaining. A degraded or freshly fitted uncalibrated cell has a steeper voltage sag curve under high-draw events than the IC expects. The phone interprets the voltage collapse as empty and shuts down to protect the cell. Run the recalibration cycle described above; if shutdowns persist past two full cycles, check that the cell connector is fully seated and the terminal voltage at rest reads at least 3.7V before charging.