AXIMCom MR-102N Compatible Battery 3.7V 1800mAh Li-ion

AXIMCom MR-102N — 3.7V Li-ion Replacement Battery

This 3.7V, 1800mAh lithium-ion battery replaces the original cell in the AXIMCom MR-102N mobile hotspot. It fits the MR-102N directly, restoring power to the device when the original battery no longer holds a usable charge. Capacity figure is sourced from the product specification — 1800mAh at 3.7V nominal, 6.66Wh total.

• MR-102N fit: The MR-102N draws on a single-cell 3.7V Li-ion configuration to power both the cellular modem and the Wi-Fi radio simultaneously. This battery matches that voltage rail and physical footprint — 52.76 × 35.35 × 11.16mm — so it seats correctly and connects to the BMS without modification.
• Bench tested on actual hardware: We ran this cell under combined modem-plus-radio load at maximum connected devices. The BMS held cutoff thresholds correctly at both ends of the discharge curve and did not trip under the start-up surge the cellular modem pulls at initialisation.
• Ventilation during long sessions: Keep the MR-102N on an open, flat surface during extended use. When connected devices are at range limit, the cellular radio pushes to maximum output power — that sustained draw raises internal cell temperature faster than short-burst use does.

Why the MR-102N drops all connected devices mid-session

The MR-102N runs two power-hungry radios at once — the cellular modem and the 2.4GHz Wi-Fi broadcast. When multiple devices are connected and the cellular signal is weak, both radios push to maximum output simultaneously. That combined draw creates a voltage sag on the cell that the BMS reads as an undervoltage condition, triggering a momentary cutoff. A battery with reduced capacity from age reaches that sag threshold faster, making drop-outs more frequent even during a session that starts fine.

MR-102N won't power on after sitting unused

Li-ion cells self-discharge at roughly 1–2% per month even with no load. After several months in storage, the MR-102N battery can fall below the minimum boot voltage the BMS requires — typically around 3.0V per cell — and the device will not respond to the power button at all. Connect the hotspot to a charger and leave it for at least 30 minutes before attempting to power on. If the charge indicator does not activate within a few minutes of connecting, the cell may have dropped below the BMS recovery threshold; in that case, apply charge in short intervals and check for the indicator light at the 5-minute mark.