Around 39 million people in the world are thought to be completely blind and according to the World Health Organization, 90% of visually impaired people live in low and middle-income countries. Blindness can be caused by lots of different illnesses and injuries  includingt diabetes, macular degeneration, severe eye injuries, cornea …

Battery usage has expanded from mobile phones and laptops to LED lamps, portable fans, toys, toothbrushes, and even automobiles. Now, the battery applications are expanding further as the Internet of Things, Industry 4.0, big data, mobile and cloud computing are introduced. People build systems to obtain, manage and utilise data …