Lumsing 11000mAh 5-Port USB External Battery Pack Charger Power Bank for $19.99. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for eference. It has 5 USB ports to charge several devices at the same time. At the time of this post, about 93% the customer reviews have given it 4/5 and 5/5 stars.