Trevi Sicuro 10 Compatible Battery 3.7V 1200mAh Li-ion

Trevi Sicuro 10 — 3.7V Li-ion Replacement Battery

This 3.7V Li-ion cell replaces the original battery in the Trevi Sicuro 10 mobile phone. It delivers 1200mAh (4.44Wh) — matching the stock capacity this handset was built around. Dimensions are 53.00 x 33.90 x 5.70mm, so it fits the original battery bay without modification.

• Sicuro 10 form factor: The Sicuro 10 uses a compact removable cell with a low-current BMS suited to a basic phone load — modest screen, no background sync overhead. This cell matches that BMS voltage threshold and connector pinout exactly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Sicuro 10 platform. The BMS accepted charge from the stock charger without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold under load.
• Fuel gauge recalibration on first install: On first use after installation, disable any fast-charge mode for one complete discharge-charge cycle. This lets the phone's fuel gauge IC learn the new cell's discharge curve before making percentage calculations against it.

Sudden shutdown at 20–30% on the Sicuro 10 after a cell swap

The Sicuro 10's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has a slightly different internal resistance profile, so the IC misjudges where the voltage cliff sits. When the phone places a brief high-current demand — backlight burst or a call connection — the new cell's voltage dips below the IC's shutdown threshold earlier than the displayed percentage suggests. One full discharge-to-charge cycle rewrites that calibration. After that cycle, the reported percentage and actual cutoff point realign.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this cell dropped below approximately 2.5V per cell before installation, the BMS enters lockout mode and blocks current flow to protect against unsafe charging of a deeply discharged cell. The phone shows nothing — no charging indicator, no boot attempt. Connect the stock charger and leave it undisturbed for 20–30 minutes. Most BMS circuits include a trickle pre-charge stage that slowly raises cell voltage back above the 2.5V threshold before allowing normal charge current to flow.