Franklin A50 Replacement Battery 3.8V 4850mAh ICQ037NA

Franklin A50 / JEXtream RG2100 — 3.8V Li-Polymer Replacement Battery (ICQ037NA)

This is a 3.8V, 4850mAh (18.43Wh) Li-Polymer battery for the Franklin A50, JEXtream, and RG2100 mobile hotspot devices. It replaces OEM part number ICQ037NA. When the original battery can no longer hold a charge through a full session, this is the direct swap.

• A50, JEXtream, and RG2100 fit: All three models share the same physical footprint, connector pinout, and BMS handshake protocol — the hotspot firmware reads cell voltage and temperature data from the same register map across this platform.
• Bench tested on actual hardware: We ran this battery under simultaneous modem and Wi-Fi load with multiple connected clients. The BMS held stable voltage delivery and did not trigger a protective cutoff under combined radio draw.
• Ventilation during extended sessions: Keep the hotspot flat on an open surface during long sessions. When connected clients are far from the device, the cellular radio runs at peak output power — that heat sits directly against the battery. A blocked surface traps it and accelerates cell wear over time.

Why the A50 drops connections mid-session on a new battery

When several devices are connected at once, the modem and Wi-Fi radio draw current simultaneously. If the battery cell voltage sags under that combined load, the BMS briefly throttles output to protect the cell — the hotspot drops connections for a few seconds before recovering. This is more common when cellular signal is weak, because the modem increases transmit power to compensate. Keeping connected client count within the hotspot's rated maximum and placing the unit near a window reduces modem output demand and flattens the draw curve.

A50 won't power on after sitting unused for several weeks

Li-Polymer cells self-discharge during storage. If the A50 sat long enough, the battery may have dropped below the minimum boot voltage — typically around 3.0V per cell — and the BMS locks output to prevent deep-discharge damage. Plug the hotspot into its charger and leave it connected for at least 30 minutes before attempting to power on. If the charge LED does not activate within a few minutes, try a different charging cable, as the BMS recovery draw is low and a resistive cable can prevent the circuit from initiating.