About this replacement
Sprint TX340GT — 3.7V Li-Polymer Replacement Battery (BTPCDTX340GT18L-GP)
This 3.7V, 1800mAh lithium-polymer battery replaces the OEM unit in the Sprint TX340GT and PCDTX340GT mobile hotspots. It slots into the same battery bay with the same connector orientation as the factory cell. Capacity is rated at 6.66Wh — identical to the original specification.
- TX340GT and PCDTX340GT compatibility: Both models run the same modem board and draw power through the same 3.7V rail with an identical BMS handshake. The battery management circuit recognises this cell without triggering a rejection flag on either variant.
- Bench tested on actual hardware: We ran the TX340GT under a simulated five-device load with the cellular radio active. The BMS held a stable output voltage through charge cycles and did not trip the low-voltage cutoff prematurely.
- Cellular signal and battery load: Keep the hotspot within reasonable range of a cell tower during long sessions. When the device operates in a weak-signal area, the modem ramps to maximum transmit power continuously — this draws significantly more current from the cell and accelerates heat buildup inside the casing.
Why the TX340GT drops connected devices mid-session
The TX340GT runs both the cellular modem and the WiFi radio simultaneously. At peak load — five connected clients plus a weak LTE signal — combined current draw can exceed what an aged or partially charged cell can deliver without a voltage sag. When output voltage dips below the modem's minimum operating threshold, the unit resets the wireless stack to protect the hardware. The WiFi clients read this as a disconnection. A fresh cell at full charge holds the voltage rail stable through those peak-draw moments.
Hotspot not powering on after sitting unused for several weeks
Lithium-polymer cells self-discharge slowly in storage. If the TX340GT sat long enough for the battery to drop below roughly 3.0V, the BMS may lock the cell out of normal charge mode as a protection measure. Plug into the OEM charger and leave it connected for at least 20–30 minutes without pressing the power button — most BMS circuits run a trickle pre-charge routine that recovers the cell before switching to standard CC/CV charging. If the indicator LED shows any activity after that window, the cell is recovering. If there is no LED response after an hour, check that the charger output reads 5V with a multimeter before assuming the battery is unrecoverable.