Verizon Jetpack 4620LE Replacement Battery 3.7V 1350mAh

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

This 3.7V, 1350mAh Li-ion battery replaces the original power cell in the Verizon Jetpack 4620LE and compatible Hotspot models including the 2235, 2372, and 3352. It matches the original OEM dimensions at 65.80 × 43.60 × 5.00mm and connects directly to the existing BMS contacts. Rated at 5Wh total energy output.

• Jetpack 4620LE, Hotspot 2235, 2372, and 3352 compatibility: These models share the same battery bay dimensions, 3.7V voltage rail, and BMS communication protocol. OEM part numbers 40115118.001 through .003 are hardware revisions of the same cell — this battery covers all three alongside the primary 40123111.00 reference.
• Bench tested on actual hardware: We ran this cell on a Hotspot 3352 under a simulated eight-device WiFi load with concurrent LTE data transfer. The BMS held stable at 3.7V nominal throughout the draw cycle and triggered low-voltage cutoff at the expected threshold without dropping connections prematurely.
• Cellular radio heat management: Keep the hotspot off soft surfaces and out of pockets during extended sessions. When connected devices are far from the hotspot, the cellular radio increases output power automatically — this raises internal temperature and accelerates cell wear over repeated cycles.

Hotspot disconnecting users mid-session on a new battery

A fresh battery that still drops connections is usually a voltage sag problem, not a capacity problem. The Jetpack 4620LE runs both its LTE modem and WiFi radio simultaneously — at maximum connected devices, that combined draw can pull the cell voltage down sharply during bursts. If the BMS reads that sag as a low-voltage fault, it briefly cuts output and the hotspot resets. Reduce the active device count or move the hotspot closer to the cellular tower to lower radio output power and flatten the load curve.

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

Li-ion cells self-discharge during storage, and the Jetpack's BMS will refuse to boot if terminal voltage falls below roughly 3.0V. This is a protective lockout, not a failed battery. Connect the hotspot to the OEM charger and leave it for at least 30 minutes before attempting to power on — the charger applies a low-current recovery charge that brings the cell back above the minimum boot threshold. If the device still shows no response after 45 minutes on charge, check that the charger is delivering output with a multimeter at the cable tip.