Brondi Amico Favoloso Replacement Battery 3.7V 800mAh

Brondi Amico Favoloso — 3.7V Li-ion Replacement Battery

This 3.7V, 800mAh (2.96Wh) lithium-ion cell replaces the original battery in the Brondi Amico Favoloso mobile phone. It fits the phone's battery bay and connects to the same charge circuit as the factory cell. Voltage and capacity match the stock specification exactly.

• Amico Favoloso fit: The Amico Favoloso runs a simple charge IC tuned to a 3.7V nominal cell at low capacity. This replacement matches that voltage rail and cell footprint — 53.00 × 34.00 × 4.80mm — so the battery seats flush and the connector engages without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, monitoring BMS cutoff at both ends. The protection circuit tripped correctly at the low-voltage threshold and accepted charge current without thermal events.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge down to auto-shutdown, then charge to 100% before normal use. The Amico Favoloso's fuel gauge IC calibrated to the old cell's discharge curve — it needs one complete cycle against the new cell before percentage readings stabilise.

Sudden shutdown at 20–30% on the Amico Favoloso after a cell swap

This happens because the fuel gauge IC still references the discharge curve of the degraded original cell. When the new cell hits a voltage point the IC misreads as critical, it triggers shutdown even though usable charge remains. The fix is a full calibration cycle — discharge the phone completely to auto-off, then charge uninterrupted to 100%. After one complete cycle, the IC maps the new cell's curve and the early shutdowns stop.

Phone shows erratic percentage jumps after battery replacement

The coulomb counter inside the Amico Favoloso accumulates error when a new cell with different internal impedance replaces a degraded one. The IC has no reference data for the new cell, so percentage readings skip or jump — sometimes gaining or losing 10–15% in seconds. This is not a fault with the replacement cell. Let the phone complete two full discharge-to-charge cycles and the counter re-anchors to the new cell's actual charge state.