Running out of power during your full-day out-and-about Skyrim Switch marathons? I’d say it might be time to invest in some portable (Nintendo) power.

Full disclosure: I’m not sponsored in any way, but regardless, I’ve been a huge Anker fan for quite some time. I’ve been using the excellent PowerPort surge protectors for all my gaming consoles and TVs for several months now with flawless results (and no electrical fires, so that’s a plus). Similarly, I’ve had a great experience with Anker’s wireless PowerPort phone charging stand, which has my Samsung Note up and running faster than any Qi device I’ve used prior. Additionally, Anker’s PowerCore series of portable batteries have really come in handy during recent extended trips and outings. Simply put, the company produces really nice tech accessories and without much realizing it, I’ve taken to exclusively using their products for pretty much anything charging-related.

As you can imagine, I was a little excited when I heard about Anker’s new line of Switch peripherals, the first official Nintendo-licensed batteries on the market. Sure, you can change your console via most certified USB-C batteries, but why bother with any of that bootleg nonsense when there’s now an optimized and undeniably legitimate option available?

So what sets these Miyamoto-blessed PowerCores apart from Anker’s typical unbranded variants? Superficially, they’re stamped with the bonafide Nintendo Switch logo, so you know you’re using a product sanctioned by Mario and his merry band of miscreants. But more importantly, Anker claims that it worked closely with Nintendo on these batteries to optimize them for ideal Switch compatibility. The supposed result? Users can fully charge the system in around 3 short hours, even while the gaming hardware is in use. You can also be charging another mobile gadget simultaneously, all without sacrificing charging speed to either device. That’s thanks to Anker’s IQ technology, which smartly adapts outgoing power supply on the fly.

As of right now, there are two Anker Switch batteries available: The wedge-shaped PowerCore 13400 (1.7 Switch charges/up to 10 hours of extra playtime) and the more elongated PowerCore 20100 (2.5 Switch charges/up to 15 hours of extra playtime). Both batteries sport the same pair of ports. There’s one PD (Power Delivery) input/output, which is essentially a supercharged USB-C slot for the Switch or any other USB-C compatible devices. It’s also for charging the battery itself when plugged into an appropriate charger. Then there’s the legacy USB-A port, which will charge any relatively less sophisticated contraption you might have lying around, like other gaming controllers or the handy USB-powered fan that’s keeping you cool at the bus stop.

Anker only sent over the 13400, so that’s what I’ll be giving my impressions on specifically. Like I mentioned before, I’m a bit of an Anker fanboy, but even considering my potential bias, this battery doesn’t disappoint. The accessory is covered in a kind of matte faux rubber and the general build quality is extremely solid; it’s got some heft to it but it’s more than light enough to slip into a backpack, purse or maybe even a large pocket without real issue. It’s got a single face button to press that instantly displays how full the battery is via a ring of 8 LEDs, and while it can get warm when in use, it’s nothing crazy. But does it afford an extra 10 hours of Switch gameplay? It’s difficult to say definitively, as what you’re doing on your Switch will affect how much juice you’ll be able to get out of the 13400. From my own testing and to Anker’s credit, I’d say it’s a pretty decent approximation, but your mileage may vary.

Keep in mind that neither battery comes packaged with a wall charger, so you’ll need to use the Switch’s AC adapter to juice up these batteries, one of Anker’s own standalone plugs, another third-party piece of equipment, or plug the battery into some other available powered USB-C slot for charging. Also, it’s important to note that if you try to power-up the battery in anything other than a Power Delivery-enabled slot, charging time can take “over 20 hours” instead of the advertised 3.5. Yikes. Use that PD, man.

If you’re someone who plays their Switch in portable mode the majority of the time, I’d say the 13400 (and I’d assume the higher-capacity 20100) is an indispensable add-on for your console. It does exactly what it’s supposed to—safely and conveniently give you more playtime while away from your dock —while communicating a serious attention to design, feel and reliability. If you need a portable battery for your Switch, you honestly can’t go wrong with what Anker and Nintendo are offering here.

The 13400 and the 20100 are available now for $69.99 and $89.99 respectively on both Anker’s and GameStop’s websites. You can also pre-order either device on Amazon for a mid-August ship date.

Disclaimer: Anker provided complimentary review product for coverage purposes.