Novatel Wireless SA 2100 Compatible Battery 3.7V 3400mAh

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

This 3.7V, 3400mAh Li-ion battery replaces OEM part 40115130-001 in the Novatel Wireless SA 2100 and Tasman T1114 mobile hotspots. It fits the 4G Router variants sharing the same chassis and connector. Capacity is sourced from product data — 12.58Wh total.

• SA 2100 and T1114 platform compatibility: Both models share the same physical cell format, 3.7V nominal rail, and BMS handshake protocol — the SA-2100 and Tasman T1114 use identical battery cavities and connector pinouts, so one replacement covers the full platform.
• Bench tested on actual hardware: We ran this cell under simultaneous modem and Wi-Fi load at maximum connected-device count. The BMS held voltage within spec through sustained cellular transmission and did not trip on the combined radio draw.
• Cellular signal and heat management: Keep the hotspot in a ventilated spot during extended sessions. When the SA 2100 is far from a cell tower, the modem transmits at full output power — sustained maximum radio draw generates heat directly inside the battery cavity and accelerates cell wear over time.

Voltage sag on the SA 2100 when multiple devices are connected

The SA 2100 runs two power-hungry subsystems at once — the cellular modem and the Wi-Fi radio. At maximum client connections, combined draw spikes sharply. A degraded original cell cannot sustain the 3.7V rail under that spike, so the BMS cuts output to protect the cell. The hotspot then drops all connected sessions simultaneously, which looks like a network fault but is a battery voltage event. A fresh 3400mAh cell provides enough headroom to hold the voltage rail stable through those peaks.

SA 2100 shows full charge indicator but shuts down under load

This symptom points to a cell with high internal resistance — the voltage reads correctly at rest but collapses the moment load is applied. The BMS reads the open-circuit voltage, reports a healthy state of charge, then trips the protection circuit when voltage drops too fast under the modem's draw. Replacing the cell is the only fix — a reconditioning cycle will not recover a high-resistance cell. After fitting the new battery, allow a full uninterrupted charge to 4.2V before first use under load.