Brondi AMICO SUPERVOICE W11 Compatible Battery 3.7V 1050mAh

Brondi AMICO SUPERVOICE — 3.7V Li-ion Replacement Battery (W11)

This is a 3.7V, 1050mAh Li-ion battery replacing part number W11 in the Brondi AMICO SUPERVOICE, SUPERVOICE, and INTREPID 4G mobile phones. All three models share the same battery bay dimensions — 52 x 32 x 5mm — and the same W11 cell. Swap is mechanical: disconnect the old cell, seat the new one, and power on.

• AMICO SUPERVOICE / INTREPID 4G compatibility: These models run the same battery rail at 3.7V nominal with an identical connector and BMS handshake profile. One replacement cell covers all three device variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, monitoring BMS cutoff at the low-voltage threshold. The protection circuit tripped correctly at cell depletion and accepted a full recharge without fault flags.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to automatic shutdown — do not top up mid-cycle. This gives the phone's fuel gauge IC a clean reference point against the new cell's discharge curve before it starts reporting percentage accurately.

Why the AMICO SUPERVOICE reports wrong battery percentage after a cell swap

The phone's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC has no reference data for its actual capacity or voltage characteristics. Until it recalibrates, the percentage reading can jump, stall, or read higher than the real state of charge. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter against the new cell. After that single cycle, percentage tracking stabilises.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the cell voltage drops below the modem's minimum supply threshold under load — even though the fuel gauge still reads 20–30%. The original cell degraded gradually, so the phone's shutdown threshold was never triggered until deep in the discharge curve. A new cell with a steeper voltage cliff at low charge can hit that cutoff earlier than expected. Check the cell is seated flush with no connector play, and complete two full discharge-charge cycles — the fuel gauge IC adjusts its low-voltage prediction after repeated full cycles, shifting the reported percentage closer to the actual cutoff point near 3.2V.