Brondi Centurion 1 Replacement Battery 3.7V 2000mAh

Brondi Centurion 1 — 3.7V Li-ion 2000mAh Replacement Battery

This is a 3.7V Li-ion battery rated at 2000mAh (7.4Wh), built as a direct cell replacement for the Brondi Centurion 1 smartphone. It fits the original battery bay and connects to the device's charge IC and fuel gauge circuit. Install it when the original cell no longer holds a usable charge across a standard day of calls and messaging.

• Centurion 1 fitment: The Centurion 1 uses a fixed 3.7V nominal rail with a removable cell bay. This replacement matches that voltage, the physical footprint (70.18 × 60.00 × 4.67mm), and the connector orientation so the fuel gauge IC can read cell state correctly from first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge passes on a monitored rig. The BMS held charge termination voltage at 4.2V and protected the cell on discharge without dropping the device mid-session under voice call load.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging if your charger supports it, then run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve before any high-current session.

Why the Centurion 1 reports wrong battery percentage after a cell swap

The Centurion 1 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When you install a fresh 2000mAh cell, the IC has no stored data for it and defaults to the old curve, which makes percentage readouts unreliable for the first few cycles. The gauge may show 100% shortly after charging begins, or drop 10–15 points in a few minutes under screen or modem load. One complete discharge down to auto-shutdown followed by a full charge to 4.2V lets the coulomb counter rebuild its reference map. After that cycle, percentage tracking stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem's minimum supply threshold under transmission load, even though the fuel gauge still shows charge remaining. A fresh cell with an uncalibrated fuel gauge IC will read 25% while the actual cell voltage collapses past 3.4V during a call. The BMS triggers a protective shutdown before the display can update the percentage. Charge fully to 4.2V, run one uninterrupted discharge cycle to auto-shutdown, and the gauge will re-anchor its low-voltage cutoff estimate to the correct point on the new cell's curve.