About this replacement
Hytera BD300 Series — 3.8V Li-ion Replacement Battery (BL2202)
The BL2202 is a 3.8V, 2000mAh Li-ion battery for the Hytera BD300, BD302, BD302i, and BD352i digital two-way radios. It slots into the same housing as the original pack and connects through the same contact strip. Capacity figure is drawn directly from the product specification — 7.6Wh total energy.
- BD300 and BD352i platform fit: All four models share the same battery bay dimensions, contact layout, and BMS handshake protocol. The 3.8V nominal rail is consistent across the series, so one pack covers the full lineup without adapter or modification.
- Bench tested on actual hardware: We cycled this pack through transmit loads on the BD302 platform and monitored BMS response under PTT current draw. The protection circuit held at expected thresholds with no false overcurrent trips during sustained RF output.
- First-insertion contact check: If the charger dock shows a fault LED immediately after inserting a new BL2202, remove the pack and wipe the gold contact strip with a dry cloth before reseating. A new BMS at storage voltage sometimes fails the dock's acceptance check on the first handshake — a clean contact cycle resolves this without any settings change.
Why the BD300 cuts out mid-transmission on a freshly inserted BL2202
The BD300's transmit stage pulls a sharp current spike the instant PTT is pressed. On a new cell sitting at storage voltage — typically around 3.6–3.65V — the BMS can read that spike as an overcurrent event and trip the protection circuit before a single word goes out. This is not a faulty pack. The cell simply needs one or two charge cycles to bring it to full operating voltage, which raises the BMS's headroom above the trip threshold. Charge the BL2202 fully before field use and the cutout stops.
Bar indicator showing one fewer bar than expected after swap
The BD300 series uses a voltage-threshold bar indicator — each bar corresponds to a fixed voltage band, not a fuel gauge chip. A new BL2202 at storage voltage of 3.6V sits in a lower threshold band than a fully charged cell at 3.8V, so the radio correctly shows fewer bars even though the pack is not depleted. This is expected behaviour, not a defect. Charge the pack to full and the indicator will read the correct bar level — confirm the charger shows green before judging capacity.