Datang CM311 Compatible Battery 3.8V 2100mAh HD495060ARV

Datang CM311 — 3.8V Li-ion Replacement Battery (HD495060ARV)

This is a 3.8V, 2100mAh (7.98Wh) lithium-ion battery for the Datang CM311 portable Wi-Fi hotspot. It replaces OEM part HD495060ARV and restores full function when the original cell degrades. Dimensions are 63.11 × 50.35 × 5.30mm — measure your existing battery before ordering if you are unsure.

• CM311 hotspot fit: The CM311 runs its cellular modem and Wi-Fi radio off the same 3.8V cell. This battery matches the voltage rail and physical footprint the BMS expects. A mismatched voltage will trip the protection circuit before the device boots.
• Bench tested on actual hardware: We cycled this cell under combined modem and Wi-Fi load at full connection count. The BMS held voltage above the cutoff floor through sustained draw and passed the protection trip thresholds we check on every hotspot battery we stock.
• Cellular radio heat management: Keep the CM311 in an open, ventilated spot during long sessions. When connected devices are far from the hotspot, the cellular radio runs at maximum transmit power — sustained heat from that load accelerates cell wear faster than any other operating condition on this device.

CM311 dropping connected devices mid-session on a new battery

When the CM311 is at maximum client count and the cellular signal is weak, the combined modem and Wi-Fi draw can spike hard enough to sag the cell voltage below the BMS cutoff threshold — even on a new battery. The device reboots, which every connected user sees as a drop. Reducing the maximum connected device limit in the CM311 admin panel lowers sustained current draw and keeps the voltage rail stable. If the issue tracks with poor signal areas, the radio is pulling maximum output power; moving the hotspot closer to a window usually brings cell voltage back above the sag point.

CM311 not powering on after sitting unused in a drawer

Li-ion cells self-discharge at roughly 1–3% per month. Left long enough, the CM311 battery will drop below the minimum boot voltage the BMS requires — typically around 3.0V on a 3.8V nominal cell — and the device will not respond to the power button at all. Connect the CM311 to its charger and leave it for at least 20–30 minutes before attempting to power on; the BMS needs time to confirm the cell is above the recovery threshold before it will allow discharge. If the indicator light never appears after an hour on charge, the original battery has deep-discharged past recovery and this replacement cell is the correct next step.