About this replacement
Telox TE320 — 3.8V Li-ion Replacement Battery (TEB-4000)
This is a 3.8V, 4000mAh (15.2Wh) Li-ion replacement battery for the Telox TE320 two-way radio. It uses OEM part number TEB-4000 and fits the TE320 portable handset used across security, construction, hospitality, and emergency services roles. Swap it in when the original pack no longer holds a charge through a full shift.
- TE320 platform fit: The TE320 runs a 3.8V single-cell Li-ion architecture with a fixed connector footprint and BMS handshake. This pack matches that voltage rail and connector geometry, so the radio's charge circuit recognises it without firmware flags or indicator errors.
- Bench tested on actual hardware: We cycled this pack through full charge and load discharge on the TE320 platform. The BMS handled transmit-current spikes cleanly and did not trigger overcurrent lockout during sustained PTT sequences.
- First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TE320 dock requires a clean contact cycle to accept the new BMS handshake before charging begins.
Why the TE320 drops to reduced TX power mid-shift on a new TEB-4000
A new Li-ion cell ships at storage voltage — typically 3.6V to 3.65V, not a full 3.8V charge. The TE320 monitors rail voltage under RF load, and if it sags below the radio's TX power threshold during a long transmission, the radio steps down output power automatically. This is not a faulty pack — it is the radio protecting its finals under a partially charged cell. Charge the pack fully to 4.2V before the first shift and the behaviour stops.
Bar indicator showing one fewer bar than expected after inserting TEB-4000
The TE320 reads battery state through voltage thresholds, not a fuel gauge chip. A new pack at storage voltage sits near the threshold between the top two bar levels, so the display shows one bar fewer than a freshly charged pack would. This is a voltage reading, not a capacity fault. Put the pack on the dock for a full charge cycle and the indicator will read correctly at 4.2V.