Power bank that has a nice 3amp speed charger output. 12,000mah. 2 options available, red or silver. I went the cheaper route.
Use 10% off code HKIW6R9P
$12.99ac for the Silver one
$11.99ac for the Red one ( https://www.amazon.com/dp/B071KSBGNS)
https://www.amazon.com/dp/B01LC1YO8Y
https://www.amazon.com/dp/B01LC1YO8Y