The instructions for rebuilding batteries which have already been given, pages 328 to 374, apply also to all U. S. L. batteries. In working on the old U. S. L. batteries, illustrated in Fig. 243, draw out the electrolyte down to the tops of the plates so that the electrolyte is below the lower end of the vent tube. Then blow out any gas which may have collected under the cover with compressed air or bellows. Never fail to do this, as there is only a small vent hole in the cover through which the gas can escape, the vent tubes extending down into the electrolyte when the cells are properly filled.
Fig. 244 shows the new U. S. L. cover construction. Note that the special cell filling device is no longer used. U. S. L. batteries have lead bushings moulded into the cover. These bushings fit around the posts, and are burned to the posts and top connectors, Figs. 243 and 244, thus giving leak proof joints between the cover and the posts. In burning on the connectors, melt bottom edge of hole first, then top of post and cover bushing, and melt in your burning lead slowly.
PREST-O-LITE BATTERIES
Some of the old Prest-O-Lite batteries have a lead bushing around the post, Fig. 245, similar to the U. S. L. batteries. This will make a perfectly tight seal, provided that you screw the bushing up tight. The new types of Prest-O-Lite batteries have a "Peened" post seal, special instructions for which follow.
The general instructions for rebuilding batteries given on pages 328 to 374 apply to Prest-O-Lite batteries in every respect. The "Peened" post seal is, however, a special construction, and directions for working on this seal are as follows: