Blaupunkt America 3.7V Replacement Battery 9801.000007.00

Blaupunkt America — 3.7V Li-ion Replacement Battery (9801.000007.00)

This is a 3.7V, 1100mAh Li-ion battery for the Blaupunkt America smartphone. It replaces part number 9801.000007.00 when the original cell degrades or stops holding a charge. Capacity is 4.07Wh at the rated voltage.

• Blaupunkt America fit: The America uses a compact 64.50 × 46.00 × 4.50mm cell with a single-cell Li-ion architecture. The connector pinout and BMS handshake match the original board, so the charge IC recognises the replacement cell correctly.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the bench. The BMS reported no fault flags, charge termination triggered at the correct cutoff voltage, and the fuel gauge IC accepted the new cell without throwing a calibration error on first boot.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and let the phone run through one complete discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Blaupunkt America

This is a voltage cliff failure. As a Li-ion cell ages, its internal resistance rises and it can no longer sustain the voltage rail under combined modem and display load. The phone's power management IC sees the voltage drop below its cutoff threshold even though the fuel gauge still reads 20–30%. Replacing the cell resolves it, but the fuel gauge IC may still show premature shutdowns for the first cycle until it re-maps the new cell's actual discharge curve. Let the phone complete one full discharge before drawing any conclusions.

OS reporting wrong percentage after cell swap

The fuel gauge IC on the Blaupunkt America uses a coulomb counter calibrated against the original cell's charge and discharge profile. Swapping in a new cell invalidates that learned curve, so the reported percentage drifts — often reading 100% while the phone still shuts down early. One full discharge from 100% to automatic shutdown, followed by an uninterrupted charge to 100%, forces the coulomb counter to re-anchor its endpoints. After that single cycle, percentage reporting tracks accurately.