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Minuteman II Missile Battery 1962-1978

Minuteman II Missiles were in service from 1962 until 1997.  Currently Minuteman III are still in service.

You are looking at the cross section of part of a Minuteman Inter Continental Ballistic Missile.  The rectangular object in the center is a Delco-Remy designed and built silver-zinc battery that powered the inertial guidance system.  Photo via Gene Phillips.

Here are photos of a battery that had been tested in Plant 21 (Basement of Plant 11).  Government inspection procedures called for every Xth battery to be tested.  These batteries had the electrolyte stored separately from the cells, making them a dry battery until activation.  When a firing current was applied to the explosive squibs in the battery fired releasing the electrolyte into the cells and the battery became active.  The explosive squibs were manufactured in the Phoenix, AZ area and before they could be shipped, 50% of them had to be successfully test fired at the manufacturer with a DR representative on hand.  I got to be that representative once in my brief career in Missile Battery.

The top two terminals were for the squib.  The bottom four were for (2) 28 volt dc outputs.

This is an early battery.  The last ones were built in 1978.

While we were the OEM the Autonetics Division of North American also had its name on the battery as it were the prime contractor for the electronics in the Minuteman II Program.

Note from this side view this is not the same battery mounting that would be used in the battery shown in the missile cross section at the top as this one mounted on the outer diameter of the missile.  Actually two batteries were supplied.  One powered the general electronics in the missile and the other the inertial guidance system.  Both had to supply current for only 120 seconds because by that time the Minuteman II was activated, out of the silo and on its way to its predetermined target, no doubt in the former Soviet Union.  As a ballistic missile once it had fired and established its trajectory, the rocket motors dropped off and the nuclear warhead was basically a high tech artillery shell on its way though the upper atmosphere to the target determined by classical physics.  Luckily none of this ever happened for real, for it if had, none of us would probably be around to either write or read this webpage.