If only a glowing carbon is used the result will be a smeary mass and in the majority of cases will not hold, due to the fact that it is not welded but simply attached in one or two points.
The principle of lead burning is to weld or burn two parts into one solid mass and not merely attach one to the other.
Keeping Wood Separators In Stock
No wood separators should be used except those furnished by the Delco-Light Company. These should be kept in distilled water, to which has been added 1.220 electrolyte in the proportion of one part to ten parts of water. It is advisable whenever possible to use new separators when making repairs on a cell. Separators which have been in service are liable to be damaged by handling.
Freezing Temperature of Electrolyte
The freezing temperatures of electrolyte in the Delco-Light batteries depends upon the specific gravity of the battery. The Delco-Light battery fully charged, with a specific gravity of 1.220, should not freeze above a temperature of 30 degrees below zero. Since, however, the freezing point rises very rapidly with a decrease in specific gravity, special care should be taken to keep batteries charged when temperatures below zero are encountered. The following table shows freezing temperatures of several different gravities of electrolyte.
| Specific Gravity | Freezing Point |
|---|---|
| 1.100 | 19° F. above zero. |
| 1.150 | 5° F. above zero. |
| 1.175 | 6° F. below zero. |
| 1.200 | 16° F. below zero. |
| 1.220 | 31° F. below zero. |
At the temperature given, the electrolyte does not freeze solid, but forms a slushy mass of crystals, which does not always result in jar breakage.
Care of Cells in Stock
Frequently a Dealer or Distributor will have several sets of new batteries in stock for five or six months. In this case, the cells should be given a freshening charge before putting into service. This charge should consist of charging the cells to maximum gravity.