Batteries are a form of supply of electrical power. They have a major impact in all areas. Batteries are used for starting vehicles. Batteries are used in all forms of communication devices.I remember when my parents had the first telephone installed in our farm home in NH. The batterybox that contained the four large "dry cells" was larger than the phone box ( a hand crank affair) Every cell phone uses batteries. So, the impact is tremendous. Transportation, comunication and power equipment to help with the daily work load generally rely on batteries
With the rapidly expanding use of solar power to recharge the batteries the future use of electrical devices in remote or rural areas, appears to me to be a growing field of usage for batteries.