SpeedyBee Flex25
At 140 g dry the Flex25 is 200.6-227 g ready to fly on the 6 matching 4S packs listed below (650 mAh): the pack is 30-38% of all-up weight.
| Class | cinewhoop (ducted) |
|---|---|
| Wheelbase | 78 mm |
| Weight (no battery) | 140 g |
| Prop size | 2.5 " |
| Motors | SpeedyBee 1404 4500KV |
| VTX system | analog TX800 (HD O3/Falcon variants) |
What battery does the Flex25 use?
| Cells | 4S |
|---|---|
| Capacity | 650 mAh |
| Recommended range | 450-850 mAh |
| Connector | XT30 |
| Chemistry | LiPo |
Matching packs from our database
All-up weight is this quad's 140 g dry weight plus the pack's own weight.
| Battery | mAh | C | Weight | All-up weight | Price/Wh |
|---|---|---|---|---|---|
| CNHL MiniStar 650mAh 4S | 650 | 70C | 87.0 g | 227 g | $1.97 |
| GNB Gaoneng 650mAh 4S | 650 | 120C | 70.0 g | 210 g | $2.12 |
| GNB Gaoneng Square Type 650mAh 4S | 650 | 80C | 79.0 g | 219 g | $2.13 |
| RDQ RDQ Series 650mAh 4S | 650 | 60C | 60.6 g | 200.6 g | $2.28 |
| Tattu 650mAh 4S | 650 | 95C | 82.0 g | 222 g | $2.39 |
| XILO Essential 650mAh 4S | 650 | 100C | 80.0 g | 220 g | $3.27 |
Flex25 flight time
The Flex25 flies ≈ 4.5 min on the 650 mAh pack listed above at our 7 A cruise-current estimate, with 80% of a pack used.
Where this data comes from
78mm wheelbase unibody duct - 2.5in props in 2in-class footprint. Gemfan D63-3. Source archived 2026-01-19: the manufacturer page for this revision was taken down when the model was superseded, so the citation points at the Internet Archive copy of https://www.speedybee.com/speedybee-flex25-analog-cinewhoop/. The specs were verified against that page when written.