MrSeb writes: "If a recent US patent is anything to go by, Apple may be working on an iBattery — a universal charging system for mobile devices and peripherals; a system that can recharge everything from wireless keyboards to smartphones to Kindles. Apple’s patent, titled “Battery charging system for mobile and accessory device,” outlines a simple setup: You have a host machine (a PC), an iBattery, and a variety of devices that can accept power from the iBattery. You would charge the iBattery inside the host system (which in this case looks to be an iMac with battery slots down the side), and then you plug the iBattery into your keyboard, mouse, or smartphone when they need recharging. In essence, the iBattery would be just like one of those “emergency” smartphone chargers with a couple of AA batteries inside — but aren’t we getting ahead of ourselves, though? Don’t we already have a universal charging standard in the form of USB?"