By simply adding an indicative and interactive pull-up tag to the overall design, Lift-ring Battery solves the mystery of which used batteries in your drawer have juice in them. The design also adds the purpose of easy ejection from devices. Intuitive to use and with the promise of a low-cost design, this seems to be a good solution.
Designers: Weimin Xu, Tao Xu, Luanqi Li and Minghan Cai
( H/T: Yanko Design )