Novatel Wireless SA 2100 Compatible Battery 3.7V 2600mAh

Novatel Wireless SA 2100 / Tasman T1114 — 3.7V Li-ion Replacement Battery (40115130-001)

This 3.7V, 2600mAh Li-ion battery replaces part number 40115130-001 in the Novatel Wireless SA 2100 and Tasman T1114 mobile hotspot devices. It fits the SA-2100 and the 4G Router variants that share the same battery bay and connector. Capacity figures come directly from the product specification — 9.62Wh total energy.

• SA 2100 and Tasman T1114 platform fit: Both devices run the same 3.7V battery rail and use an identical connector and BMS handshake protocol, which is why one part number covers the full range. Swapping between variants requires no adapter or firmware change.
• Bench tested on actual hardware: We ran this cell under a combined modem-plus-WiFi load simulating four active client connections. The BMS held steady at 3.7V nominal through the discharge curve and tripped at the correct low-voltage cutoff without false shutdowns.
• Cellular signal and battery load: In poor signal areas the SA 2100's modem boosts transmit power to maintain a 4G link, pulling significantly more current than in strong-signal conditions. Position the hotspot near a window or external wall to reduce radio output power and slow the draw on this cell.

Why the SA 2100 drops all connected devices mid-session

When the SA 2100 is running at maximum client connections, the combined current draw from the cellular modem and the WiFi radio can cause a voltage sag on an aged or partially charged cell. The BMS interprets that sag as a low-voltage event and cuts output to protect the cell, which the device reads as a power failure — dropping all sessions instantly. A fresh cell with lower internal resistance maintains voltage under that combined load without triggering the cutoff. If drop-outs happen on a new battery, check that the hotspot is not enclosed in a bag or case where heat is trapping around the unit.

SA 2100 shows battery icon but will not boot after sitting unused

Li-ion cells self-discharge at roughly 1–3% per month in storage. If the SA 2100 has been shelved for several months, the cell can fall below the minimum boot voltage — typically around 3.0V — even though a small residual charge remains. At that level the BMS blocks output entirely, so the device appears completely dead. Connect the hotspot to a charger and leave it for at least 20–30 minutes before attempting to power on; the charger circuit will trickle current into the cell until it recovers above the 3.0V BMS enable threshold and the device can start its boot sequence.