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A new battery charging specification that defines a standard on how devices should draw current through USB from wall chargers or PCs was released from the USB promoter group.

Issues addressed in the new specs is defining a mechanism for devices to detect whether they are attached to a AC charger, host or hub. Should the gadget detect it’s plugged into a high-powered port, it can negotiate for power in excess of 500mA. Otherwise, the current limit is 2.5mA, 100mA or 500mA. The group also comes up with a provision in the new specs to allow portable devices with dead batteries to recharge at 100mAh even if they are not able to power up.

Source: everythingusb

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