NGM Fred BL22 Li-ion Replacement Battery 3.7V 950mAh

NGM Fred — 3.7V Li-ion Replacement Battery (BL22)

This is a 3.7V, 950mAh Li-ion replacement battery for the NGM Fred smartphone. It uses part number BL22 and slots directly into the Fred's battery bay. Capacity figure matches OEM spec at 3.52Wh.

• NGM Fred fit: The Fred uses a fixed 3.7V single-cell architecture with a standardised BL22 connector footprint. The BMS handshake on this platform is straightforward — no proprietary authentication chip between the cell and the phone's charge IC.
• Bench tested on actual hardware: We cycled this cell through the Fred's charge IC and confirmed the BMS holds charge termination correctly at 4.2V. The protection circuit tripped cleanly at the low-voltage floor during deep discharge testing — no runaway condition observed.
• Fuel gauge recalibration on first use: On the first charge after installation, let the phone discharge to automatic shutdown before plugging in. The Fred's fuel gauge IC was calibrated to your old cell's discharge curve — one full cycle gives it a fresh reference point against the new cell.

Why the NGM Fred reports wrong battery percentage after a cell swap

The Fred tracks capacity using a coulomb counter that built its discharge model against your original cell over months of use. When you swap in a new cell, that stored model no longer matches the actual discharge curve. The phone reads voltage and applies the old curve — so 60% on screen may mean the new cell is actually at 40% or 75%. One complete discharge-to-shutdown followed by a full charge resets the reference, and percentage accuracy improves significantly from the second cycle onward.

Sudden shutdown at 20–30% on the replacement cell

This happens because a fresh cell has slightly different internal impedance than a broken-in one. Under load — screen backlight plus modem TX burst — the terminal voltage drops sharply. The phone's low-voltage protection reads that transient dip as a dead battery and cuts power. It is not a faulty cell. After two to three full charge cycles, internal impedance settles and the voltage cliff flattens. If it persists past cycle three, check that the battery contacts on the Fred's board are clean and making full contact.