Sepura SRP2000 Replacement Battery 7.4V 1800mAh

Sepura SRP2000 Series — 7.4V Li-ion Replacement Battery (300-00002)

This 7.4V 1800mAh Li-ion pack replaces the OEM battery in the Sepura SRP2000, SRP3000, SRC3300, and SRG3500 portable radios. It uses the same cell configuration and BMS as the original 300-00002 pack. Voltage and connector match the factory spec — no modification needed.

• SRP/SRC/SRG platform fit: The SRP2000, SRP3000, SRC3300, and SRG3500 all share the same battery bay geometry, 7.4V voltage rail, and BMS handshake protocol. One pack covers the whole platform because Sepura standardised the interface across this radio family.
• Bench tested on actual hardware: We cycled this pack through full charge and transmit-load draws on the SRP2000 platform. The BMS handled the PTT current spike without tripping, and the charger dock accepted the pack on first insertion without fault codes.
• Contact strip seating on first dock insertion: If the SRP charger shows a fault LED when you first dock this pack, remove it, wipe the gold contact strip with a dry cloth, and reseat firmly. The Sepura dock runs a BMS handshake on insertion — a partial contact breaks the cycle before it starts.

Why the SRP2000 cuts out mid-transmission on a new battery

A new cell ships at storage voltage — typically 3.6–3.8V per cell, not the 4.2V full-charge peak. Under the transmit current spike, that lower starting voltage can sag below the BMS cutoff threshold, which trips the protection circuit and kills TX mid-press. The radio isn't faulty and neither is the pack. Run one full charge cycle on the Sepura dock before the first operational shift. After a complete charge, the cell voltage is high enough that PTT draw no longer hits the cutoff floor.

Bar indicator showing one fewer bar than expected after fitting this pack

The SRP2000 reads battery level from voltage thresholds — it has no fuel gauge chip. A new pack at storage voltage reads one bar low because the cell sits below the top threshold until fully charged. This is not a capacity defect. Charge the pack fully on the Sepura dock and the indicator will step up to the correct bar count. If it still reads low after a full charge, check the dock contacts are clean and the pack is seated squarely — a weak contact causes an artificially low voltage reading at the radio's sense pin.