ReadyToSky 20A 2-4S Mini BLHeli_S OPTO ESC

This compact 20A OPTO electronic speed controller suits FPV race and freestyle builds running 2-4S power systems, in a small format for space-constrained frames and lightweight quads.

Key features

• Runs BLHeli_S firmware, supporting DShot150/300/600, PWM, Oneshot125 and Oneshot42 signal protocols.
• OPTO design has no onboard BEC, so it expects a separate regulated supply for the flight electronics.
• Supports two-way mode and 3D flight mode for reversible motor rotation.
• Built-in temperature-sensor protection helps guard the ESC during hard use.
• Small, light build suits builds where frame space and all-up weight are tight.

Specifications

• Continuous current: 20A
• Maximum current: 25A
• Input voltage: 2-4S
• Firmware: BLHeli_S
• BEC: None (OPTO)
• Dimensions: 27 x 14 x 5 mm

Confirm the current rating, battery range and motor requirements closely match the aircraft before installation, and pair it with a regulated 5V supply for the flight controller and receiver.