Don't ever mix fresh and empty batteries again

Use the battery direction to indicate
whether it is full or empty

If you're like me you waste your time trying to figure out which battery is full from the other ones.

Alkalines.eu solves that issue elegantly: all you have to do is put your charged batteries upright in your battery box and the empty one upside-down.

If you feel you are going to forget this, you can simply print their logo and stick it on your battery box.

Read the original post here.