I asked about finding a AAAA battery holder a few weeks ago, because I couldn't find one on the web. So I made a single AAAA cell holder out of a piece of pc board and some spring clips.
I tore apart a couple 9V batteries and found that usually 5 out of the
6 AAAA cells inside were not dead, usually only one cell was bad and caused the battery to fail.I've been putting those halfway good cells in the battery holder and running a V boost circuit to drive a white LED. I put one in the holder and it might have a beginning voltage of 1.35 or so volts, and I let it run until it is well below a volt, usually below .8V.
What gets me is the every single cell fails by the same process. The top (negative) contact pops open and the cell leaks some juice, and of course the contact doesn't make contact with the inside of the cell.
This means to me that every 9V battery will fail and leak juice inside of the radio, usually corroding the contacts and doing other damage. This is something that I feel shouldn't happen. The cells shouldn't make a mess or do damage.
But every single cell has failed in this same way. Doesn't this seem to be a defect that should not happen, or rarely happen? Has anyone else verified this?