Orange Roya Replacement Battery 3.8V 2000mAh Li-ion

Orange Roya / OT-5042X — 3.8V Li-ion Replacement Battery

This is a 3.8V, 2000mAh Li-ion cell for the Orange Roya and OT-5042X (5042X) smartphones. It replaces the original cell when the phone no longer holds charge through a normal day. Voltage and capacity match the factory spec exactly.

• Roya / OT-5042X fitment: The Roya and 5042X share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the OT-5042X platform. The BMS accepted the cell cleanly, charge termination triggered at the correct cutoff voltage, and the protection circuit responded normally to load.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Roya reports wrong battery percentage after a cell swap

The fuel gauge IC on the OT-5042X stores a learned discharge curve from the original cell. When you install a new cell, the IC is still reading against that old curve, so the percentage on screen drifts from the actual state of charge. This gap closes after one full discharge and charge cycle. Until that cycle completes, the percentage shown may be off by 10–20 points. Run the phone down to auto-shutdown and charge to 100% without interruption to complete the recalibration.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a faulty cell. Under peak modem or screen load, the cell's internal resistance causes a voltage drop that crosses the BMS low-voltage cutoff — even though the gauge still shows charge remaining. It happens most on replacement cells before the fuel gauge has recalibrated. After one full discharge-charge cycle the gauge aligns and the shutdowns stop. If they continue after two full cycles, check that resting voltage sits above 3.7V before the next charge.