THE FUSE

There isn't a single generally accepted definition of fast charging. However, with power adapters capable of sending as little as five watts or less, it's important to know how much juice your device is getting, especially if you need to recharge something quickly. So depending on who you ask (particularly when it comes to smartphones), any charger that can push out more than 15 to 18 watts is generally considered to be "fast." That said, with some phones capable of receiving more than 100 watts and up to 240 watts for some laptops, it's more important than ever to consider what devices you own before buying a new fast charger.