You need batteries for one of your many gadgets…you stare into the abyss of the junk drawer and wonder which of the Alkaline and rechargeable AA’s are still good/charged up. If only you had a battery tester…or a multimeter handy, that would help. But you don’t.
Well, if you wave a Nintendo Wii, you might just have one.
Throw those batteries in the Wii remote and flip it over. When you tap the A button there is a brief flash on the lights. 1-4 lights. This is telling you the charge in the batteries in 25% increments. Once the remote connects to your Wii the light changes to indicate your player number, so you have to watch before it changes.
Looks like these were full charged when I put ‘em away.