1. The panels connect to a lithium iron battery, which can store solar energy for later use.

2. It offers up to 180 hours of use on a single charge of its lithium battery.

3. Personal electronic devices containing lithium batteries are considered as dangerous goods.

4. The solar cells recharge four lithium polymer batteries, which provide power for night flying.

5. Companies are making billions in lithium mining.

6. It runs on four lithium polymer batteries at night.