The Freefly Astro SL8-Air Battery is a smart 157 Wh Li-ion pack tailored for Astro. Two SL8-Air batteries deliver up to 37 min of flight, recharge in 90 min on the SL8 Fast Charger, and report health via OLED and CAN. Integrated 60 W USB-C PD port powers field gear; airline-carry-on approved.
Freefly SL8-Air Battery delivers smart, airline-safe power for every Astro mission. Two packs give up to 37 minutes of flight, while an onboard micro-controller handles charging, balancing, and health reporting—no balance leads, no guesswork.
Smart, Flight-Ready Power
- Integrated BMS manages charge, discharge, and cell balancing automatically.
- OLED display shows % state-of-charge, voltage, current, cycle count, and alerts.
- Freefly Open Battery Interface lets the pack communicate health data to Astro and Auterion Suite.
USB-C PD Utility
- 60 W USB-C Power Delivery port charges phones, tablets—even most laptops—in the field.
- Keep radios, sensors, and lights topped up without extra bricks or generators.
Rapid Recharge & Airline Safe
- Pair with the SL8 Fast Charger: ~90 min 0 → 100 % per pack.
- USB-C SL Charger: ~2.5 hr with a 100 W PD supply.
- 157 Wh capacity meets most airline carry-on limits for Li-ion batteries.
Open & Future-Proof
- Designed for Astro but compatible with any platform that uses the Freefly Open Battery Interface.
- Field-replaceable via simple lever latch—hot-swap and keep flying.
Freefly SL8-Air Battery delivers smart, airline-safe power for every Astro mission. Two packs give up to 37 minutes of flight, while an onboard micro-controller handles charging, balancing, and health reporting—no balance leads, no guesswork.
Smart, Flight-Ready Power
- Integrated BMS manages charge, discharge, and cell balancing automatically.
- OLED display shows % state-of-charge, voltage, current, cycle count, and alerts.
- Freefly Open Battery Interface lets the pack communicate health data to Astro and Auterion Suite.
USB-C PD Utility
- 60 W USB-C Power Delivery port charges phones, tablets—even most laptops—in the field.
- Keep radios, sensors, and lights topped up without extra bricks or generators.
Rapid Recharge & Airline Safe
- Pair with the SL8 Fast Charger: ~90 min 0 → 100 % per pack.
- USB-C SL Charger: ~2.5 hr with a 100 W PD supply.
- 157 Wh capacity meets most airline carry-on limits for Li-ion batteries.
Open & Future-Proof
- Designed for Astro but compatible with any platform that uses the Freefly Open Battery Interface.
- Field-replaceable via simple lever latch—hot-swap and keep flying.
SL8-Air Battery
| Voltage | 21.6 V (6 S) |
| Capacity | 7.3 Ah / 157 Wh |
| Weight | 2.25 lb / 1.02 kg |
| Chemistry | Lithium-ion, high-density 21700 cells |
| Flight endurance* | Up to 37 min per pair on Astro |
| Aux output | USB-C Power Delivery (up to 60 W) |
| Interface | Freefly Open Battery Interface (smart CAN bus) |
| Display | Integrated OLED (SOC, voltage, current, cycles) |
| Compliance | 157 Wh—airline carry-on compatible; includes ESD sticker (SB007) |
| Origin | Designed & assembled in USA |
Charging Options
| SL8 Fast Charger | ~90 min 0 → 100 % (optimal) |
| SL USB-C Charger | ~2.5 hr with 100 W PD source (sub-optimal) |
| Connector | One-plug smart interface—no balance leads |
| Cycle life | 500+ cycles (with proper care) |
*Endurance varies with payload, temperature, and flight profile—see Astro Wiki for detailed charts.
(1) SL8-Air Battery (157 Wh)
Platforms
All Astro drones (requires two packs per flight)
Charging
SL8 Fast Charger — optimal, ~90 min 0 → 100 %
SL USB-C Charger — ~2.5 hr with 100 W PD source
Transport & Storage
SL8 Travel Case
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