Battery full or flat? This simple test reveals it All you need for this test is the battery you want to check. If available, have a new, fully charged battery ready to compare the results. This is how it works:

Make sure you have a flat and firm surface, such as a table, in front of you. Drop the battery vertically onto the surface from a height of about 20 centimeters (roughly 8 inches). Pay close attention to how the battery hits the surface and how it behaves afterwards: A fully charged battery usually tips over and stays put. An empty battery, on the other hand, often bounces back a little and bounces up a few centimeters. Why? Alkaline batteries contain a gel-like substance that absorbs the impact when fully charged. When the battery is flat, this substance dries out and hardens, making the battery more likely to bounce back.

Extend battery life with these 4 tips Switch off devices correctly: Make sure you switch devices off completely when