If the 8,000mAh battery we shared a deal on a couple of days ago didn't have enough juice for you, here's something that might pique your interest: Amazon is discounting a 20,100mAh RAVPower battery to $31.99 after a clip coupon, an all-time low price for this battery.
This battery is equipped with four ports in total: two USB-As, one USB-C, and one microUSB input. One USB-A charges at Quick Charge 3.0, and the other maxes out at 2.4A. The USB-C port is rated at 3A. It's worth noting that this battery doesn't have Power Delivery. I personally bought this exact battery in 2017 for $52, and it's performed without issue.
The advertised $33.99 price is already the lowest ever, but there's also a $2 clip coupon that brings the price down to $31.99. Prime shipping is free. Hit the link below to pick one up.