When you need to test out whether your batteries are in full working or not, you can use a battery tester. These clever little gadgets will give you an accurate reading of exactly how much juice is left in your little power cells. But not everyone has one of those little gizmos (we certainly haven’t). So how else can you test batteries? Well, we’ve a real clever little trick here for you that works all the time and costs nothing.
This neat little hack works a treat and can be used on AA, AAA, C, D batteries. Find out how to test your batteries quickly and easily without any tools or meters or anything: