> For the complete documentation index, see [llms.txt](https://docs.freeflysystems.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.freeflysystems.com/ecosystem/power/superlight-batteries/specifications.md).

# Specifications

## Capacity and Voltage

| Model        | Voltage, nominal (V) | Voltage, min - max (V) | Capacity (Ah) | Capacity (Wh) |
| ------------ | -------------------- | ---------------------- | ------------- | ------------- |
| SL8 - Air    | 21.6                 | 18 - 25.2              | 7.3           | 157           |
| SL4 - Ground | 21.6                 | 18 - 25.2              | 4.1           | 86.4          |

|                               |                                                                  |
| ----------------------------- | ---------------------------------------------------------------- |
| Ambient Temperature           | -20 °C to 50 °C                                                  |
| Battery Cell Temperature      | 10 °C to 50 °C                                                   |
| Charging Temp                 | 0 °C to 50 °C                                                    |
| Weather                       | Moderate rain (\~3 mm per minute)                                |
| Drop rating                   | 1 meter                                                          |
| USB Power Delivery            | 60 Watts (Up to 3 A at the following voltages: 20, 15, 12, 9, 5) |
| Cell Chemistry                | Lithium-Ion                                                      |
| Cell Type                     | <p>SL8 : Samsung 40T</p><p>SL4 : Lishen LR2170SF</p>             |
| Max Continuous Current (10 s) | <p>SL8 : 80 A</p><p>SL4 : 13.5A</p>                              |
| Max Peak Current (1 s)        | <p>SL8 : 120 A</p><p>SL4 : 20 A</p>                              |
| Mass                          | <p>SL8 : 1035 g</p><p>SL4 : 600g</p>                             |

## Transport

### Airline Travel

Please consult local regulations.

![](/files/HRkM0XtedEbTVOBd6G8w)

{% hint style="warning" %}
\*SL-4 model is not compatible with Astro.
{% endhint %}

Detail of FAA regulations here:

* <https://www.faa.gov/hazmat/packsafe/more_info/?hazmat=7>
* <https://www.faa.gov/hazmat/packsafe/resources/media/Airline_passengers_and_batteries.pdf>

### Shipping

We've found that FedEx provides the easiest path to ship batteries. Their website has a search tool to find FedEx locations that can accept batteries can be found good shipments, go to <https://www.fedex.com/locate> > More... > Dangerous Goods Shipping > and Search in your area.

If you'd like to pack the batteries yourself, guidelines can be found in the [UPS guide to safely packing batteries](https://www.ups.com/assets/resources/media/en_US/pack_ship_batteries.pdf). Refer to the Lithium batteries section (SL batteries are classified UN3481). These guidelines are universal across shipping providers.


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