https://newatlas.com/review-switchcharge-nintendo-switch-battery-case/54807/

With every new games console comes a whole ecosystem of third-party accessories, but most of them aren't as necessary as they'd have you believe. Thankfully, that's not the case with the SwitchCharge, a beefy battery pack for the Nintendo Switch. After a few weeks with the device, we're happy to report that it actively solves some of Nintendo's niggles, earning its place in our bag basically every time we leave the house with the Switch.