They could be wall clocks or torch lights or game controllers or AC remote controllers or TV remotes or the pandemic must-have the pulse oximeter, many of us have a whole lot of gadgets in our house. And all of them have one common thing… they all require batteries. The batteries come in many sizes like AA / AAA/ AAAA / C / D / PP3 (9-Volt) depending on the device type. For example, AC remote controllers use AAA, TV remotes use AA and Portable (Philips) Radios use the large D size. Then there are the button or coin cells…
