Verizon Jetpack 4620LE Replacement Battery 3.7V 1500mAh

Verizon Jetpack 4620LE / Hotspot 3352 Series — 3.7V Li-ion Replacement Battery (40123111.00)

This 3.7V, 1500mAh lithium-ion battery replaces the original pack in the Verizon Jetpack 4620LE, Hotspot 2235, Hotspot 2372, and Hotspot 3352, along with five additional compatible models. It restores power to portable Wi-Fi hotspot units that have lost capacity or stopped holding a charge. Voltage and cell chemistry match the original spec exactly.

• Jetpack and Hotspot series fit: These models share the same 3.7V single-cell Li-ion architecture, connector pinout, and BMS communication protocol. Swapping the pack does not require firmware changes or hardware modification — the host device recognises the replacement through the existing BMS handshake.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the Hotspot 3352 platform. The BMS handled both the modem draw and simultaneous Wi-Fi radio load without triggering a protection cutoff. Cell voltage held steady across the mid-range of the discharge curve.
• Ventilation during extended hotspot sessions: When connected devices are far from the hotspot, the cellular radio runs at full transmit power. Keep the unit on a hard, flat surface — not a soft surface like a couch cushion — so the rear vents can dissipate heat. Trapping heat at the battery shortens cycle life faster than almost any other single factor.

Hotspot disconnecting users mid-session on a new battery

The Jetpack 4620LE and Hotspot 3352 run two radios simultaneously — the LTE modem and the Wi-Fi access point. At maximum client connections, combined current draw spikes sharply. If the replacement cell has any internal resistance above spec, voltage sags below the BMS protection floor during those spikes, and the unit drops the session to protect the cell. A battery with matched internal resistance stays above that threshold and keeps the session alive.

Hotspot not powering on after sitting unused in a drawer

Li-ion cells self-discharge at roughly 2–3% per month. After several months in storage, the pack can fall below the minimum boot voltage — typically around 3.0V for single-cell devices in this class. The hotspot's charging circuit will not start a charge cycle if it detects a cell this low, so plugging in the USB cable appears to do nothing. Connect the unit to a wall charger (not a laptop USB port) and leave it for 20–30 minutes before attempting to power on — a wall charger delivers enough current to pull the cell back above the recovery threshold.