All of the "U" size batteries have been changed to Type "D," so that all "CU" types are superseded by corresponding "DU's." Type "D" will not be used on cells of sizes "L," "H," or "A", all of which remain of the "C" or three-piece isolator construction. Type "S" remains old style as before.
Type "DJ"
The Vesta Company has added a new plate size, produced in the "D" style (one-piece) isolator only, and known as "DJ."
This plate is one-half inch higher than the "U," as shown in Fig. 267. It has 10 per cent more capacity. "DJ" batteries are available in all forms corresponding with "CU" types, and can be obtained by merely changing the type form name in ordering, as for example, to replace form 150, 6-DJ11-Y-150. The overall height of the completed battery is, of course, one-half inch more, and the "DJ" should therefore be ordered only when this additional height space is available in the battery compartment of the car.
Vesta Separators
The Vesta separators, or "mats," are treated by a special process. The Vesta Company considers its "mats" a very important feature of the battery. See page 15.
Vesta Post Seal
A lead collar fits over each post to hold the cover tight against the soft rubber gasket underneath. This collar is not screwed or burned on the post, but is simply pressed down over the post, depending for its holding power upon the fact that two lead surfaces rubbing against each other tend to "freeze," and unite so as to become a unit. The connector rests upon the upper race of the collar, and also helps to hold it down in its proper position. Fig. 270 shows the complete battery with the lead collar, and the large vent plug.
In rebuilding Vesta batteries having the lead collars, the cover should be left in place when working on the plates, if possible. If, however, it is necessary to separate groups, and the lead collars must be removed, this is done as shown in Fig. 271. A few blows on the side of the collar with a light, two ounce hammer expands the lead collar several thousands of an inch so that the collar may be removed.