Simvalley PX-1755 Replacement Battery 4.8V 700mAh Ni-MH

Simvalley PX-1755 / PX-1761 — 4.8V Ni-MH Replacement Battery (PX-1754-919)

This 4.8V, 700mAh Ni-MH battery replaces the original pack in the Simvalley PX-1755 and PX-1761 two-way radios. It matches the OEM voltage rail and connector footprint for both models. Capacity figure is sourced from product data — 3.36Wh total energy.

• PX-1755 and PX-1761 shared platform: Both radios run the same 4.8V cell stack, connector pinout, and BMS handshake protocol — one pack covers both. Swapping between models requires no adapter or wiring change.
• Bench tested on actual hardware: We cycled this pack through PTT transmit bursts on the PX-1755 and monitored the BMS response under the transmit current spike. The protection circuit held voltage above the low-power threshold throughout sustained keying.
• First-insertion contact check on the PX-1755 dock: If the charger shows a fault LED on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to register the new pack's BMS state before charging starts.

PX-1755 bar indicator showing one fewer bar than expected on a new pack

Ni-MH cells ship at storage voltage — typically 1.1–1.15V per cell — not at full charge. On the PX-1755, the voltage-threshold bar indicator reads this as a partially depleted pack, not a full one. This is normal cell state, not a fault with the replacement battery. Run one full charge cycle through the dock and the indicator will reflect actual charge level.

PX-1755 cuts out mid-transmission after several months of use

Ni-MH cells in short-range radios are vulnerable to shallow-cycle degradation — repeated partial charges without full discharge reduce usable capacity over time. When the pack can no longer sustain voltage above the BMS cutoff during the transmit current spike, the radio drops the transmission. This is cell capacity fade, not a radio fault. Condition the pack by running it to low-battery indicator before each recharge, and verify resting voltage sits at or above 4.8V before keying.