Other Nine Volt Batteries
There were several other sizes of nine volt batteries. Two are still available, the PP7 and PP9. These date from the days of early transistor radios and are now less common than PP3. The PP4, PP5, PP6, PP10 and PP11 (this latter battery was actually a 4.5+4.5 volt battery) sizes have long been obsolete. There was no PP2 size, and the PP1 and PP8 were 6 volt (the latter being designed for electric fence use and is still available). In the days of valve radios which used batteries designed specifically for vacuum tubes, there was a nine volt grid bias battery or (US) 'C' battery which had tappings for various voltages between 1.5 and 9.
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