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.
Financing options through Approve, more information here
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.
| 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 |
| 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) |
In The Box:
Compatibility
All orders over $5000 within the Continental U.S. will ship for free!
Place your order by 1pm est and we will ship all in-stock items the same day.
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All sales include access to our U.S.-based support team. - 866-376-6375
