The boy with the brain that never turns off (aka J6) asked for a multi-meter this Christmas. You may remember it was featured in the doll house light post. He has enjoyed it immensely and for those who are worried, he is strictly forbidden from certain uses that shall remain nameless. He can use it with his Snap Circuits and to test batteries (now that he has learned the proper procedure for that).
This battery is dead...not worth recharging.
We can charge this one- it lives!
All in an effort, by the way, to replace the batteries in his Nerf weapon. These are important things in life.
What sort of engineer will J6 be? Right now he is thinking the triple threat- chemical, electrical, and most definitely mechanical.