SpeedyBee BLS 35A Mini V2 20x20 4-in-1 ESC

SpeedyBee's BLS 35A Mini V2 is a 20 × 20 mm BLHeli_S 4-in-1 ESC for 2–4" quads and lightweight 5" freestyle, racing and cinewhoop builds on 3–6S. It pairs with any 20 × 20 flight controller that drives motors over DShot.

Key features

• 35 A continuous per motor, 45 A burst for 5 seconds; the board holds 140 A combined for up to 30 seconds.
• Six-layer 2 oz copper PCB with Japanese TDK filter capacitors and an onboard TVS diode against voltage spikes.
• BLHeli_S J-H-40 firmware running DShot300 or DShot600.
• Current sensor output (scale 250, offset −500) for battery consumption readout in Betaflight.
• VBAT output to power the flight controller; ESC telemetry is not supported.

Specifications

• Firmware: BLHeli_S J-H-40
• Continuous current: 35 A × 4
• Burst current: 45 A (5 s)
• Protocol: DShot300 / DShot600
• Input: 3–6S LiPo
• Power output: VBAT
• Current sensor: scale 250, offset −500
• ESC telemetry: not supported
• Mounting: 20 × 20 mm, 3.5 mm holes for M2 or M3 screws with grommets
• Dimensions: 35 × 35 × 5.5 mm
• Weight: 7.2 g

The ESC has no BEC, so the flight controller must supply 5 V and VTX power from its own regulators. For heavier 5" freestyle rigs, choose a higher-rated 4-in-1; this board is at its best on 2–4" frames and light 5" builds.