San Francisco, Mar 9 (IANS): A patent filed by Apple has revealed that the company was working on a new charging connector to juice up its devices.

According to the Patently Apple website, the US Patent and Trademark Office on Thursday published a pair of Apple patent applications that show the change in the shape of the charging adaptor, known as "lighting connector".

The central idea behind developing this wedge-shaped next-generation connector is to increase water resistance by creating a tight vacuum seal and strengthening it with the addition of a generator and pistons inside the device.

"Unplugging your iDevice would become more complex as this requires breaking the vacuum seal, something Apple proposes is done through a software interface on the phone," Forbes reported.

However, the patent filing does not confirm that when Apple would change the current Lightning port to the new one as notably, the 2018 iPhone design changes are already finalised and all models have the regular Lightning port.