This is a very durable and rugged battery pack! I’ve used it and abused it and it keeps on working. It’s Waterproof, Shock-proof and Dust/Dirt-proof. I’ve repeatedly dropped it on concrete, kicked it down the road, left it over night in a 5 gallon bucket of water. Still worked after all that abuse. I try to put my stuff through more abuse in a week than the average person will in their lifetime.