Happymodel Mobula8 O4
Happymodel
The 2026 Mobula8 — 2S outdoor whoop with the O4 eye
An 85mm 2S brushless whoop from Happymodel pairing its Mobula8 frame with the standard DJI O4 Air Unit — an outdoor machine for pilots who want DJI's low-latency digital video and onboard 4K/60 recording at whoop-class weight.
US pricing sits at the high end for an 85mm BNF.
The full story
Released December 2025, with US retail from January 2026, the Mobula8 O4 pairs Happymodel's 85mm 2S Mobula8 frame with the standard DJI O4 Air Unit. The electronics are well equipped for the class: a CrazyF405HD carrying an STM32F405, BMI270 gyro, BMP280 barometer, current sensor, 8MB blackbox, and 12A BLHeli_S Bluejay ESCs, driving EX1103 11000KV motors on Gemfan Hurricane 2023 tri-blade props.
Video comes from the standard O4 Air Unit — 1080p live view at up to 100fps with low latency, plus onboard 4K/60 recording that stabilizes well in Gyroflow. Happymodel adds its 3.2g FOV-extender lens kit with UV, ND8, and ND16 filters, widening the camera to about 150 degrees, and an angle-adjustable canopy. This is the standard O4 rather than the O4 Pro, so it has the smaller 1/2-inch sensor and no 4K/120 or 10-bit recording.
In the air it is smooth, stable, and notably quiet, with around 5 minutes of on a 2S 550mAh . Happymodel claims 50g dry; Oscar Liang measured 52.6g dry and 82.2g all-up with a 2S 550mAh pack — heavy for the whoop class, which keeps it squarely outdoors. The receiver is true (v3.0.1) with the full 25-500Hz packet-rate menu and standard Configurator updates. A no-air-unit version exists for pilots who already own an O4.
Pros & cons
Pros
- True UART ExpressLRS receiver (v3.0.1, HappyModel EP 2400 RX target) with full 25-500Hz packet-rate options and standard ELRS Configurator updates - not an receiver
- DJI O4 Air Unit delivers 1080p up to 100fps low-latency live view plus onboard 4K/60 recording, and footage stabilizes well in Gyroflow
- Included FOV-extender lens kit (about 3.2g) widens the camera to roughly 150 degrees and ships with UV, ND8, and ND16 filters
Show all 6 pros
- Smooth, stable, and notably quiet in flight, with around 5 minutes of freestyle on a 2S 550mAh LiHV
- Well-equipped F405 flight controller: BMI270 gyro, BMP280 barometer, 8MB blackbox, current sensor, and 12A Bluejay ESCs
- Angle-adjustable canopy, and a cheaper no-air-unit version exists if you already own an O4
Cons
- Factory PID tune and filtering are suboptimal (the stock dump even mislabels the craft as Mobula7) and bidirectional DShot is not enabled out of the box
- ELRS antenna dangles unsecured and is vulnerable in crashes
- O4 camera is hard-mounted with no vibration isolation
Show all 7 cons
- Wide-angle extender lens introduces vignetting and edge softness, and it obstructs the front canopy screws
- Factory-installed ND8 filter is too dark for indoor flying and needs removal
- Uses the standard O4 unit, not the O4 Pro - smaller 1/2-inch sensor and no 4K/120 or 10-bit recording
- At about 82g on 2S it is a heavy whoop-class quad, and US pricing is at the high end for an 85mm
Specs
Retailers & price history
| Retailer | Current | Stock | Lowest confirmed | Highest confirmed | Checked |
|---|---|---|---|---|---|
| Pyrodrone | $294.99 | In stock | $294.99 (2026-07-02) | $294.99 (2026-07-02) | 2026-07-04 |
| RaceDayQuads | $260.49 | Sold out | $260.49 (2026-07-02) | $260.49 (2026-07-02) | 2026-07-04 |
Current = cheapest ready-to-fly configuration (video system included, ELRS) tracked at that retailer; sold-out rows show the last listed price. Lowest/highest are from every confirmed scan since 2026-07-02 — the log grows with each stock check.
Replacement parts & batteries
Crash spares that fit this model, checked against the shops like everything else. Batteries show three price tiers — $ lowest, $$ middle, $$$ highest — among compatible in-stock packs.
Batteries
| Part | Price | Availability |
|---|---|---|
| Tattu 2S 450mAh 95C LiHV (Long Type, XT30) $ 2S 450mAh 95C LiHV · XT30 · 62.5×16.2×14.7mm long pack · JST-XH balance |
$7.99 | In stock at Pyrodrone |
| Gaoneng GNB 2S 530mAh 90C LiHV (Long Type, XT30) $$ 2S 530mAh 90C LiHV · XT30 · 26g · 13×17×64mm long pack |
$10.99 | In stock at RaceDayQuads |
| Flywoo Explorer 2S 550mAh 80C LiHV (2-pack, XT30UP) $$$ 2S 550mAh 80C LiHV · XT30UP (XT30-compatible Amass-sheath pigtail) · sold as 2-pack |
$20.99 | In stock at Flywoo (direct) |
Props
| Part | Price | Availability |
|---|---|---|
| Gemfan Hurricane 2023 Tri-Blade Props (1.5mm shaft) 52.17mm (2in) tri-blade · 2.3in pitch · 1.5mm press-fit · 8 pack |
$2.99 | In stock at RaceDayQuads |
Motors
| Part | Price | Availability |
|---|---|---|
| Happymodel EX1103 11000KV Motor EX1103 11000KV · 9N12P 11x3mm stator · 1.5mm shaft · 3.8g · sold per motor |
$14.99 | In stock at Pyrodrone |
Frames
| Part | Price | Availability |
|---|---|---|
| Happymodel Mobula8 85mm Frame 85mm wheelbase · 11.5g · max 51mm props · transparent black |
$4.49 | Sold out at RaceDayQuads |
Canopies
| Part | Price | Availability |
|---|---|---|
| Brain3D Canopy for Mobula8 DJI O4 TPU canopy for Mobula8 + DJI O4 (Lite) · not O4 Pro compatible |
$14.99 | In stock at RaceDayQuads |
Video
| Part | Price | Availability |
|---|---|---|
| DJI O4 Air Unit (standard) Standard O4 air unit · 1080p/100fps link · 4K/60 onboard · single antenna |
$119.00 | In stock at Sub250 (direct) |
Flight controller
| Part | Price | Availability |
|---|---|---|
| Happymodel CrazyF405HD ELRS 1-2S AIO Flight Controller F405 + 12A BLHeli_S 4-in-1 ESC + UART ELRS 2.4G RX · 25.5mm mount · 1-2S |
$65.99 | Sold out at RaceDayQuads |
Chargers
| Part | Price | Availability |
|---|---|---|
| Flywoo EasyPower E24 2S Battery Charger EasyPower E24 · Flywoo's OEM 2S charger for Explorer XT30UP packs (E16/E24 listing; E24 = 2S model) |
$29.99 | In stock at Flywoo (direct) |
| ToolkitRC M450 50W Mini Balance Charger (2S-4S) 50W 5A mini balance charger · charges 2S packs via their JST-XH balance lead (the standard on all XT30 2S whoop packs) |
$47.99 | In stock at RaceDayQuads |
Other spares
| Part | Price | Availability |
|---|---|---|
| Happymodel FOV Extender Kit for DJI O4 Camera Wide-angle lens + UV/ND8/ND16 filters + Mobula7/Mobula8 canopy · 3.2g |
— | not auto-checked — confirm at retailer |