A few years ago, the idea of a mouse pad that charges your mouse while you play became all the rage. It seems to have died down lately, though, probably because both elements (mouse and mouse pad) were expensive and gamers didn’t like being USB-tethered. But Logitech’s new mouse includes the tech for a shockingly low price. The G309 Lightspeed has a fairly unassuming design from the outside. It’s neither big nor small, light nor heavy, and its two-mouse-button shooter setup is pretty typical. But it’s hiding a couple of surprises inside. First, it has wireless charging capability using Logitec…