Ruiheng 8311 Replacement Battery 3.8V 2100mAh

Ruiheng 8311 / 905 / MI560 — 3.8V Li-ion Replacement Battery (HD495060ARV)

This is a 3.8V, 2100mAh Li-ion replacement battery for the Ruiheng 8311, 905, and MI560 mobile hotspot devices. It matches OEM part number HD495060ARV and slots directly into the battery bay on each of these models. Voltage and physical dimensions are matched to the original specification.

• 8311, 905, and MI560 compatibility: All three models share the same battery bay dimensions (63.11 × 50.35 × 5.30mm), the same 3.8V nominal voltage rail, and the same HD495060ARV BMS handshake. One cell fits all three without modification.
• Bench tested on actual hardware: We ran this battery under simultaneous cellular modem and Wi-Fi radio load. The BMS held steady through connect-and-drop cycles and did not trigger a false low-voltage cutoff during the peak draw that occurs when the hotspot negotiates a new cellular connection.
• Ventilation during extended sessions: Keep the hotspot in an open, ventilated spot during long use. When connected devices are far from the unit, the cellular radio runs at full transmit power — sustained heat from the radio transfers directly into the cell and accelerates capacity fade over time.

Why the 8311 drops connected devices mid-session on a new battery

When all available Wi-Fi slots are occupied and the cellular signal dips, the modem and Wi-Fi radio draw peak current simultaneously. If the cell's internal resistance is slightly elevated — common in aged batteries — the voltage sags enough to trigger the BMS protection threshold. The hotspot interprets this as a low-battery event and briefly drops the radio stack, disconnecting all clients. A fresh cell with lower internal resistance eliminates the sag and keeps the voltage above the cutoff during those combined peak draws.

Hotspot shows battery present but will not power on after storage

Li-ion cells that sit discharged for several weeks can drop below the minimum boot voltage the device firmware requires to initialise — typically around 3.0V on a 3.8V nominal cell. The BMS may also lock the cell in a deep-discharge protection state, preventing current flow entirely. Connect the hotspot to a charger and leave it for at least 20–30 minutes before pressing the power button — the charger pre-charges the cell through the BMS at a low trickle current until it clears the lockout threshold. If the LED shows any charge activity, the cell is recovering; let it reach at least 3.4V before attempting to boot.