I just used this power bank on a 10-night wilderness hunt. It performed admirably. I kept charged my Garmin InReach, Garmin Instinct watch, and Samsumg Note9. There is still some juice left in the power bank after a daily charging of my phone which I used heavily during the trip. Needless to say I'm pleased with the performance of the bank. For about $45 on Amazon it was well worth it.
OUTXE Quick Charge 20000mAh Waterproof Power Bank with Flashlight 4A Dual Input Rugged Portable Charger
Specifications
Capacity: 20000 mAh(20Ah*3.7V=74Wh)
Battery Type: Li-polymer Rechargeable Battery
Flashlight Luminous Flux: :200lm
Micro USB Input: DC 5V/2A(max)
Type-C Input: DC 5V/3A(max)
Quick Charge Output: DC 5V/3A,9V/2A,12V/1.5A (max)
Smart Output: DC 5V/2.4A(max)
Dimensions: 170×86×30 mm / 6.7×3.4×1.2 in
Weight: 525g /18.5 oz
OUTXE Quick Charge 20000mAh Waterproof Power Bank with Flashlight 4A Dual Input Rugged Portable Charger
Specifications
Capacity: 20000 mAh(20Ah*3.7V=74Wh)
Battery Type: Li-polymer Rechargeable Battery
Flashlight Luminous Flux: :200lm
Micro USB Input: DC 5V/2A(max)
Type-C Input: DC 5V/3A(max)
Quick Charge Output: DC 5V/3A,9V/2A,12V/1.5A (max)
Smart Output: DC 5V/2.4A(max)
Dimensions: 170×86×30 mm / 6.7×3.4×1.2 in
Weight: 525g /18.5 oz