About this replacement
Baofeng T1 Series — 3.7V Li-Polymer Replacement Battery (BF-T1)
This 3.7V, 1200mAh Li-Polymer battery replaces the OEM pack in the Baofeng T1, BF-T1, and BF-T1 UHF handheld two-way radios. It matches the original cell chemistry and physical footprint, including the 49.20 x 35.00 x 6.20mm slim profile that sits flush inside the T1 chassis. Voltage and capacity figures are drawn directly from the OEM specification.
- T1, BF-T1, and BF-T1 UHF compatibility: All three variants share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol. One pack covers the full T1 family without modification.
- Bench tested on actual hardware: We cycled this pack on a BF-T1 unit and confirmed the BMS accepted the new cell without triggering an overcurrent lockout during PTT press. Voltage held stable across both receive and transmit states.
- First insertion on the T1 charger cradle: If the T1 cradle LED blinks fault on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The cradle requires a clean contact cycle to register the BMS handshake before charging begins — this is not a fault with the battery.
Why the BF-T1 cuts out mid-transmission on a new battery
The T1's transmit current draw spikes sharply the moment PTT is pressed. If the replacement pack shipped at storage voltage — typically around 3.6V — the BMS may interpret that initial surge as an overcurrent event and trip the protection circuit. This is not a defective cell; it is the BMS doing its job on a partially charged pack. Give the battery a full charge cycle before first use in the field, and the BMS trip threshold will no longer be triggered by a normal PTT press.
Bar indicator showing one fewer bar than expected on a new BF-T1 pack
The T1 uses a simple voltage-threshold bar indicator, not a fuel gauge chip. A new pack at storage voltage reads approximately 3.60–3.65V, which maps to one bar below full on that threshold scale. This does not mean the cell is low capacity or faulty. Charge the pack fully until the cradle LED goes green, then power cycle the radio — the indicator will read correctly once the cell rests above 4.1V.