BBA-07 Nokia 6100 Compatible Battery 3.7V 900mAh

SVP Nokia 600 / 700 Series — 3.7V Li-ion Replacement Battery (BBA-07)

This 3.7V, 900mAh Li-ion cell replaces the BBA-07 battery in Nokia 600, 700, AGG-023, AGG-052, and related handsets. It restores power to the phone when the original cell has degraded past holding a usable charge. Dimensions are 53.00 × 34.00 × 4.80mm — measure your bay before ordering if your unit has been repaired before.

• Nokia 600/700 platform fit: These models share the same battery bay geometry, connector pinout, and BBA-07 cell spec. The voltage rail sits at 3.7V nominal, and the BMS handshake expects that same nominal to enable charging and discharge protection.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Nokia 600-series handset. The BMS accepted the cell on first insertion, protection cutoffs triggered correctly at low voltage, and charge termination fired at the expected 4.2V ceiling.
• Fuel gauge recalibration on first use: On first use after installation, complete one full discharge-to-charge cycle without interruption. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before the OS starts displaying percentage readings.

Why the Nokia 600 reports wrong battery percentage after a cell swap

The phone's fuel gauge IC stores a discharge curve calibrated to the original cell. When a new cell goes in, the stored curve no longer matches the actual voltage-versus-capacity profile of the replacement. The OS reads a voltage point on the old curve and reports a percentage that doesn't reflect real charge remaining. One complete uninterrupted discharge and full charge cycle forces the coulomb counter to relearn the new cell's curve and corrects the displayed percentage.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — GSM modem transmission bursts and screen peaks pull current the cell cannot sustain at that state of charge. The BMS reads the voltage sag as a low-cell condition and cuts power before the fuel gauge shows 0%. It is not a faulty cell — it is an uncalibrated gauge reading a voltage cliff incorrectly. Run one full discharge cycle until the phone shuts off naturally, then charge to 100% without interruption to let the gauge anchor its low-end voltage threshold at the correct point, typically around 3.2–3.3V under load.