The defunct 18650 lithium cell I used for the DSO150 power supplyprompted me to crack open a battery from a long-gone Dell laptop to see if any of its cells were in better condition:
Yup, gently crushing it in a vise splits the case enough to work the Designated Prydriver around the joint, a process considerably simplified by the knowledge the case isn’t going back together again.
Prying the top off reveals the cells and their connections:
One of the cells had corroded, accounting for the pack’s failure:
The others were undamaged, but had self-discharged down to about 1.5 V over the course of several years and refused to charge.
The moral may be to tear the pack apart as soon as it fails, a point always easier to recognize in retrospect.
So I taped the packs to prevent shorts and tossed them into the recycle box.