Philadelphia to all classes of customers
after April 1, 1920, carry the single letter branding code, indicating
month of manufacture.

The letters used in the double letter age code are selected from the
table given above, and the second letter is the important one, since
it gives the latest date from which adjustment can be made. If a
Philadelphia battery with a double letter age code comes in,
therefore, the foregoing table should be consulted in determining the
age of the battery.

If a Philadelphia battery with a single letter age code comes in, the
following table should be consulted in determining the age of the
battery:

[Image: Single Letter Philadelphia Batteries Age Code Chart]

Prest-O-Lite Age Code.

All Prest-O-Lite batteries carry a date letter stamped on the
cell-connectors. This letter indicates the month and year in which the
battery was manufactured. The letter is preceeded by a number which
represents the factory at which the battery was built.

Prest-O-Lite Factory Marks.

Indianapolis--50 Cleveland--7 San Francisco--23

For example: "50-K" indicates that the battery was manufactured at
Indianopolis in January, 1920.

In addition to the above, each "Wet" Prest-O-Lite battery is branded
in the side with a date, as "9-19," indicating October, 1919. This
date is really sixty days ahead of the actual building date, to allow
time for shipping, etc., before the guarentee starts. The branded
"9-19" was actually built in August, 1919.

Titan Age Code.

The age of Titan batteries is indicated by a number stamped on one of
the inter-cell connectors, this number indicating the month the
battery was hipped from the factory.

[Image: Age code charts for Titan batteries]

[Image: Age code charts for U.S.L., and Vesta batteries]

[Image: Age code charts for Westinghouse and Willard batteries]

RENTAL BATTERIES

Rental batteries are those which are put on a customer's car while his
own is being repaired or recharged. They are usually rebuilt batteries
turned in when a new battery is bought. They may also be made of the
good parts of batteries which are junked. By carefully saving good
parts, such as plates, jars, covers, and cases, a stock of parts will
gradually be acquired from which rental batteries may be made. Rental
batteries may also be bought from the battery manufacturers.

A supply of rental batteries should, of course, be kept ready to go
out at