About this replacement
Inrico T310 — 3.7V Li-Polymer Replacement Battery (B-50E)
This is a 3.7V, 2900mAh lithium-polymer replacement battery for the Inrico T310 two-way radio. It matches the OEM part number B-50E and slots directly into the T310's battery bay. Use it to restore full transmit power after the original pack degrades.
- T310 platform fit: The T310 runs a single-cell Li-Polymer pack at 3.7V nominal. This replacement matches that voltage rail and the OEM connector pinout, so the radio's BMS handshake completes on first insertion without requiring a firmware workaround.
- Bench tested on actual hardware: We cycled this pack through PTT transmit loads on the T310 bench unit. The BMS held the output rail steady through sustained key-up bursts and tripped cleanly at the low-voltage cutoff threshold — no false overcurrent interruptions during normal transmission.
- First insertion contact check: If the T310 charger dock shows a fault LED after inserting this pack, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock needs a clean contact cycle to register the new BMS before it begins the charge sequence.
Why the T310 cuts out mid-transmission on a freshly inserted B-50E
A new Li-Polymer cell ships at storage voltage — typically 3.6–3.75V — not at full charge. When the T310 keys up to transmit, the RF output stage draws a sharp current spike. If the cell is at storage voltage, that spike can drag the pack below the BMS overcurrent threshold and trigger an immediate cutoff. The radio goes silent mid-transmission, not because the pack is faulty, but because it hasn't been charged to its operating range yet. Charge the B-50E fully before the first use shift — the dock should show a solid green light before you carry the radio out.
T310 bar indicator showing one fewer bar than expected on a new pack
The T310 reads battery level through voltage thresholds, not a fuel gauge chip. A new pack at storage voltage sits in the same voltage band the radio reads as a partially discharged cell, so the indicator shows one or two bars instead of full. This is a voltage reading, not a capacity fault. Run the pack through one full charge cycle in the dock until the charge LED goes green, and the indicator will display the correct bar count — typically at or above 3.9V resting voltage after a full charge.