Nice, didn't realise it could be powered with a power bankOh that....a little usb power bank. Lasts for days! I use it to recharge the Tello too - just in case I find another thing to video along the way! Fairly inexpensive items. Mine has 2 usb outlets - I can recharge 2 things at one time.
Not the power bank, the repeaterOn Amazon.com - this one is even nicer than mine with the LED display - and just an cheap too! And comes with a flashlight! Darn!!
Double power bank USB charger with Flashlight and LED display - for $20!