The Linux kernel's Human Interface Devices (HID) subsystem has an existing architectural limitation that there is just up to one battery per HID device. But with modern devices -- especially among various gaming peripherals -- there can be more than one battery when considering earbuds with a battery for each earbud, multi-device wireless receivers, etc. A proposal was raised today to address this limitation.

Lucas Zampieri of Red Hat sent out the patch today proposing support for multiple batteries per HID devices to overcome this HID subsystem limitation of assuming up to just one battery per device