MobiWire Ahiga 3.8V 2000mAh Replacement Battery 178067700

MobiWire Ahiga / Pegasus — 3.8V Li-ion Replacement Battery (178067700)

This is a 3.8V, 2000mAh Li-ion cell replacing part number 178067700 in the MobiWire Ahiga and Pegasus smartphones. It restores power to both models when the original cell has degraded, swollen, or no longer holds a usable charge. Voltage and physical dimensions match the OEM spec: 76.66 × 60.95 × 3.85mm.

• Ahiga and Pegasus compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.8V nominal voltage rail — one cell covers both. The BMS handshake on each device accepts the 178067700 profile without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Ahiga platform. The BMS accepted charge from zero, balanced to full without flagging an over-voltage event, and reported state-of-charge without dropping connection mid-cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state. Skip this step and the OS may show inaccurate percentages for the first several cycles.

Sudden shutdown at 20–30% on the replacement cell

The Ahiga's fuel gauge IC was calibrated against the original cell's discharge curve. A new cell with a slightly different internal resistance profile can cross the cutoff voltage threshold earlier than the OS expects — causing the phone to shut down while the percentage display still reads 20–30%. This is not a fault in the replacement cell. One full discharge-to-shutdown followed by an uninterrupted charge to 100% gives the coulomb counter enough data to remap the curve. After two or three full cycles, shutdown behaviour should align with the displayed percentage.

Phone won't power on after the battery sat discharged in storage

Li-ion cells drop below 2.5V per cell during extended storage and the BMS enters a lockout state to prevent damage — the phone will not respond to a normal boot press. Connect the device to a wall adapter rated at 5V and leave it for 15–20 minutes without pressing anything. The charge IC needs to trickle current into the cell before voltage rises enough for the BMS to release the lockout and allow a normal power-on sequence. If the charging indicator still does not appear after 20 minutes, try a different cable — USB cables with damaged power lines are the most common cause of failed recovery at this stage.