Orbic RC-501L Replacement Battery 3.8V 2200mAh

Orbic RC-501L / RC501 Series — 3.8V Li-Polymer Replacement Battery

This 3.8V, 2200mAh lithium-polymer cell replaces the original battery in the Orbic RC-501L, RC501, RC501LS, and RC501LG smartphones. It carries 8.36Wh of usable energy and matches the original pack's physical footprint at 76.50 × 59.80 × 3.00mm. Capacity figures come from the product specification sheet, not estimated from web sources.

• RC-501L and RC501 variant compatibility: The RC501, RC501LS, and RC501LG all share the same battery bay geometry and voltage rail. The connector pinout and BMS communication protocol are identical across these variants, so one cell covers the full model range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the RC-501L platform. The BMS accepted the charge handshake immediately, held voltage flat through mid-range discharge, and tripped the low-voltage cutoff cleanly at the expected threshold without false shutdowns.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging adds error into an uncalibrated state of charge estimate.

Sudden shutdown at 20–30% on the RC-501L after a cell swap

This is a voltage cliff failure, not a capacity problem. When the modem fires a transmission burst or the screen peaks at full brightness, current draw spikes sharply. A new cell that hasn't been calibrated yet can sag below the system's minimum voltage threshold at that exact moment, triggering a hard shutdown even though the fuel gauge still shows charge remaining. The fuel gauge IC's coulomb counter is still mapped to the old cell's internal resistance curve. One full discharge cycle from 100% down to automatic cutoff, then a full charge at standard rate, resets that mapping and eliminates most cliff shutdowns.

OS reporting wrong battery percentage after replacement

The Orbic RC-501L uses a fuel gauge IC that tracks state of charge by counting coulombs in and out against a stored discharge profile. When a new cell goes in, the stored profile still reflects the old cell's degraded characteristics — so the percentage reading is immediately inaccurate. This shows up as a jump from 80% to 100% with no charging, or a sudden drop from 40% to 10% under load. Run one uninterrupted charge to full, then discharge to automatic shutdown without topping up mid-cycle. After that single cycle, the IC anchors its endpoints to the new cell and percentage accuracy stabilises.