English: A side by side comparison of a PP11 battery and the more common PP3 type battery.
This battery had 4 pin connectors. 9V was available by wiring in series. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart.
Negative and positive pins were spaced 18.1 mm apart.
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