A new and lighter, more efficient version of the solar panel that comes standard on the iPhone 6 and iPhone 6 Plus will be available in the coming months, according to a new report.

Engadgets claims the new panels are “about 30 percent lighter than existing versions, with a capacity of up to 6 kW, and are expected to be compatible with most iPhones.”

The panels are expected in the iPhone 7, which will have a lower capacity than previous iPhones, but it will likely have a slightly larger battery.

The iPhone 6S, iPhone 6, and iPhone 7 are available for pre-order now and will be launched in the fall.