I've had a few different types of Power Banks over the years. When the Nintendo Switch first came out, there really wasn't a lot of options out there. After having trudged through a lot of other devices, I came across this gem in a local Best Buy. At this point, I realized there was a difference from the mAh rating on the banks and seeing that it had 20,100, decided to give it a try. I was pleasantly surprised. It provided hours of use off of one charge. It's one of the few power banks that I have tried that actually was able to CHARGE the Switch while using it. Many of the other chargers could only charge if you weren't playing with the console. So whenever it was done charging, it would start to direct charge it. When the power bank ran out of power, the Switch was fully charged. This was after several hours of use. If you just charge the Switch and don't play it, you get about 3.5 - 4 charges from it. While playing, it depends on how active the game is as to how long it will last. You can expect at least 4 more hours no matter the intensity and I have gotten up to 8 - 10 hours with games like Pokemon. If you do a lot of internet actions, it will last less, but even when the battery runs out, you still have the Switch charge left. So, just to make sure I had juice, I bought 2 of them. We liked it so much (the wife wanted one too,) we now have 3 of them. This is from using the OG Switch, too. So, if you have the new 2.0 standard, it will last even LONGER. The purchase date listed is 3/17/2020, but we bought the 1st one about a year and a half ago. You just can't go wrong with it.