This power bank can be used underwater (but we don't recommend it)
Nitecore NB10000 Gen II (Gen 2) Ultra-Slim Power Bank, 10000mAh QC Quick-Charge USB and USB-C Dual Outputs with Cables for Phones Flashlights and Headlamps (Black), Dual Cable Bundle : Cell Phones
Nitecore NPB4 20,000mAh Quad Port Waterproof Powerbank - QC Capable - Rechargeable - Portable
The Nitecore NPB4 20,000mAh Waterproof Power Bank. Quick charge support and 18W of max output. USB-C port input/output
Nitecore NPB4 20,000mAh Waterproof Power Bank
Nitecore NB20000 QC USB & USB-C 4 Port 20000mAh Power Bank
This power bank can be used underwater (but we don't recommend it)
Nitecore Powerbank NPB4 – 20 000 mAh étanche - Noir
Nitecore NPB4 au meilleur prix sur
Nitecore NPB4 20,000mAh Waterproof Power Bank 18W of Max output
Nitecore batteries IMR Lithium ion 21700, 18650, 18350, 16340, 14500 lampes et cigarettes électroniques