Wiko RIDGE FAB Replacement Battery 3.8V 3000mAh

Wiko Ridge FAB / Ridge FAB 4G — 3.8V Li-Polymer Replacement Battery (5320 / 5320B)

This 3.8V, 3000mAh (11.4Wh) lithium-polymer cell replaces the original battery in the Wiko Ridge FAB and Ridge FAB 4G smartphones. It fits the same footprint at 86.50 × 65.80 × 4.10mm and connects through the standard flex connector on both variants. Use the OEM part numbers 5320 and 5320B to confirm fitment before ordering.

• Ridge FAB and Ridge FAB 4G compatibility: Both models share the same battery bay dimensions, flex connector pinout, and charge-management IC interface. The 4G variant draws higher peak current during LTE band switching, but the 3000mAh cell handles that load within the same BMS discharge curve as the standard Ridge FAB.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Ridge FAB platform. The BMS accepted the full charge handshake, the protection circuit tripped correctly at the low-voltage cutoff threshold, and the charge IC did not flag a fault at any point during the test cycle.
• First-cycle fuel gauge calibration: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated cell — preventing erratic percentage jumps from the first day.

Sudden shutdown at 20–30% on the Ridge FAB after a cell swap

The Ridge FAB's fuel gauge IC holds a discharge model calibrated to the original cell. When a new cell with a different internal resistance is fitted, the IC misreads remaining voltage under load — particularly during LTE transmission bursts or screen-on peaks. At around 20–30% reported charge, actual cell voltage can drop below the modem's minimum operating threshold and the phone cuts out even though the gauge still shows capacity. One full discharge-recharge cycle without fast charging lets the coulomb counter recalibrate against the new cell's actual voltage curve. After that cycle, shutdowns in this range typically stop.

Ridge FAB will not power on after sitting in storage for several months

Lithium-polymer cells in storage self-discharge slowly. If a Ridge FAB with a depleted or new replacement cell has been stored for an extended period, cell voltage can drop below 2.5V — the point at which the BMS enters lockout to prevent cell damage. The phone shows nothing on screen and does not respond to the power button. Connect it to a wall charger rated at least 5V/1A and leave it for 20–30 minutes without pressing anything; the BMS needs trickle current to recover voltage above the lockout threshold before it will allow a normal charge cycle to begin. Once the charging indicator appears on screen, the battery is back above the BMS re-enable voltage and will charge normally from that point.