First, yes, you can charge it through the wall. The Nintendo Switch docking station power adapter can be used with the Joy-Con charger. Second, the Joy-Con charger (mine at least) needs to come with a USB to USB-C cable. This cable can be used with a power bank to charge your Switch! Third, you don't need to connect the cable to the Nintendo Switch dock to charge it. If it's a high-power USB port, it's most likely charging Joy-Cons that are plugged into the charger. In other words, yes, the power bank can also be used to charge Joy-Cons that are connected to a charger. If you're running out of USB ports to charge all your Nintendo Switch accessories, which may or may not include the Switch itself, I recommend 100 PERCENT Hybrid Charging Tower. This is a charging tower with 2 AC outlets, 4 USB outlets and a 3000mAh detachable power bank. It's nearly perfect for any Switch setup. Here is Revain's direct link to it: https://www.amazon.com/100-PERCENT-Charging-Smartphones-Worry-Free/dp/B01MCRUC2O/ref=sr_1_1?ie=UTF8&qid=1550125283&sr=8-1&keywords=100+ percent +HybridBefore you ask, yes, you can use the power bank from this product to charge your switch. Assuming it's the cable that came with the Joy-Con charging handle. Oh, and one more thing: you can use the charging handle to charge your Joy-Cons overnight if needed. So to speak "reload" will not work. So charge up if you must! That's what they are here for! I lied, and one more thing: the cable that comes with the charger can also come with the pro controller. Please note that this Nintendo cable CANNOT be purchased separately! If you want one, you'll either need to get a Pro Controller or buy one of those charging pins here. Well, that was a longer review than I expected for a basic device (or at least it should be!). But seriously, people don't talk about the cable being enough to charge the Switch itself! This is very important for every Switch owner to know!
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