@gunrunnerjohn posted:"... I think they're almost universally 7-cell."
Thanks again John. I was looking for the best deal on the Eveready 9V rechargeable, Amazon being one of the better places, but some commenters warned that they were still finding 7.2 volt batteries. At one time, the 9V was called a 'transistor radio battery', but that is pretty archaic, so is the AA cell that was originally called a 'Penlight' battery. I have an old Ray-O-Vac, that amazingly has not leaked and ruined something, with the words penlight battery on the label, plus '2 for 25' cents and made in Madison Wisconsin, that makes it really archaic. My best Eveready example is a pair of D cells I found in an old aviation radio, made in November of 1952, in perfect condition, and still show about .6 volts on them, not enough to light the tube filaments though.
