118 A Rude Awakening (media.greatawakening.win) posted 2 years ago by hundro 2 years ago by hundro +119 / -1 15 comments download share 15 comments share download save hide report block hide replies
True, but you can test 9V batteries with your tongue to see if they have charge.
It was one of the most tedious and counter-intuitive part to understand "internal resistance" of a battery.