The Automobile Storage Battery Part 32

1. Remove the vent plugs and fill each cell with 1.335 specific gravity electrolyte (one part of concentrated sulphuric acid by volume to two parts of distilled water by volume) to 3/8 inch above the tops of the separators.

2. Wait 5 minutes and then fill each cell again with 1.335 specific gravity electrolyte to 3/8 inch above the tops of the separators.

3. The battery must then stand from 10 to 15 hours before placing on charge.

4. After standing for this length of time, fill each cell again, if necessary, with 1.335 specific gravity electrolyte to bring the level of the electrolyte 3/8 inch above the tops of the separators before charging.

5. Place the battery on charge at the finish rate marked on the name plate until the gravity and cell voltage stop rising. This charging will require at least 48 hours.

6. If, after a charge of 48 hours or longer the specific gravity does not rise for two consecutive hours, the gravity should be between 1.280 and 1.300. If it is not between these limits, the specific gravity should be adjusted to these values at the end of the charge.

7. If, during the charge, the temperature exceeds 110 degrees Fahrenheit, the charge rate should be reduced so as to keep the temperature below 110 degrees Fahrenheit and the time of charging lengthened proportionately.

Preparing Westinghouse Batteries for Service

(These batteries are prepared for s.h.i.+pment in what is known as export condition.)

1. Remove vent plugs and discard soft rubber caps.

2. Fill all cells with 1.300 specific gravity sulphuric acid until top of connecting straps, as seen through vent holes are completely covered. Temperature of filling acid should never be above 90 degrees Fahrenheit.

Note: The aim is to fill the cells with acid of such a Specific gravity that the electrolyte, at the end of charge, will need very little adjusting to bring it to the proper specific gravity.

1.300 specific gravity acid has been found to be approximately correct for this purpose. However, if after several batteries have been prepared for service using 1.300 specific gravity acid, considerable adjusting at the end of charge is necessary, it is permissible to use a slightly different specific gravity of filling acid, but the use of acid above 1.325 specific gravity or below 1,250 specific gravity is not recommended.

3. Allow batteries to stand after filling for from two to three hours before putting on charge.

4. Put on charge at finish charge rate shown on name plate of battery.

Note: If temperature of electrolyte in battery reaches 100 degrees Fahrenheit (determined by inserting special thermometer through vent hole in cover), the charging rate should be immediately reduced, as continued charging at a temperature above 100 degrees Fahrenheit is injurious to both separators and plates.

5. Continue charging until all cells are ga.s.sing freely and individual cell voltage and specific gravity of electrolyte have shown no decided rise for a period of five hours.

Note: The length of time required to completely charge a new battery depends largely upon the time the battery has been in stock, varying from twelve to twenty-four hours for a comparatively fresh battery to four or five days for a battery six months or more old.

6. Keep level of electrolyte above tops of separators at all times, while charging by adding distilled water to replace that lost by evaporation.

7. After battery is completely charged the specific gravity of electrolyte in all cells should be adjusted to 1.285 at 70 degrees Fahrenheit, and the level of electrolyte adjusted so that after battery is taken off charge the height of electrolyte stands 1/8 inch above tops of connecting straps.

Note: Corrections for temperature if temperature of electrolyte is above or below 70 degrees Fahrenheit the correction is one point of gravity for each three degrees of temperature. See page 65.

If specific gravity of electrolyte is above 1.285, a portion of the electrolyte should be removed and replaced with distilled water.

If the specific gravity is below 1.285, a portion of electrolyte should be removed and replaced with 1.400 specific gravity sulphuric acid. Acid of higher gravity than 1.400 should never be put in batteries.

Batteries should always be charged for several hours after adjusting gravity to insure proper mixing of the electrolyte and to see that the correct specific gravity of 1.285 has been obtained.

8. After first seven sections have been followed examine vent plugs to see that gas pa.s.sage is Dot obstructed and screw back in place.

Battery is now ready for service.

The Prest-O-Lite a.s.sembled Green Seal Battery

This type of battery is made up of the same sort of plates as the old partly a.s.sembled green seal battery. The elements are, however, completely a.s.sembled will wood separators and sealed in the jars and box in the same manner as a wet battery to be put into immediate service; the cell connectors are burned in place.

How to Store It. A room of ordinary humidity, one in which the air is never dryer for any reason than the average, should be used to store these batteries. They should be s.h.i.+elded from direct sunlight.

Examine the vents-they should be securely inserted and remain so during the entire storage period.

If these precautions are observed, this type battery may be stored for at least a year.

To Prepare Battery for Use. 1. Prepare sufficient pure electrolyte of 1.300 specific gravity. If during the mixing considerable heat is evolved, allow electrolyte to cool down to 90 degrees Fahrenheit.

Never pour electrolyte, that is warmer than 90 degrees Fahrenheit, into cells.

2. Remove the vents and lay them aside until the final charging operation has been completed.

Within 15 minutes from the time the vents are removed fill all cells to the bottom of vent openings with the electrolyte prepared, as stated above.

3. Allow the electrolyte to remain in the cells, not less than one hour. At the end of this time, should the electrolyte level fall below the tops of the separators, add enough electrolyte to bring level at least one-half inch above separators. If the temperature in the cells does not rise above 100 degrees Fahrenheit, proceed immediately (before two hours have elapsed) with the initial charging operation.

If the temperature remains above 100 degrees Fahrenheit, allow the battery to stand until the electrolyte cools down to 100 degrees Fahrenheit. Then proceed immediately with the charge. It is important that the acid does not stand in the cells for more than two hours, unless it is necessary to allow the acid to cool.

4. Initial Charging Operation. Place the battery on charge at the ampere rate given in the following table. The total initial charge must be for fifty-two hours, but at no time permit the electrolyte temperature to rise above 115 degrees Fahrenheit. If the temperature should reach 115 degrees Fahrenheit, take the battery off the line and allow the electrolyte to cool, but be sure that the total of fifty-two hours actual charging at the ampere rate specified is completed.

Initial Charge---52 Hours

Plates Type of per Cell Plate AHS WHN RHN SHC BHN JFN GM CLN KPN -------- --- --- --- --- --- --- --- --- --- 3 1.5 5 2 2 2.5 3 7 3 3 3.5 4 3 5 9 4 4 5 5 7 11 5 5 6 7 7.5 5 9 13 6 6 7 8 9 6 10.5 10.5 15 7 7 9 9.5 10.5 7 12 17 10 12 9 19 9 9 11 12 9

The nominal battery voltage and the number of plates per cell is indicated by the Prest-O-Lite type designations, i. e.: 613 RHN denotes 6 volts, 13 plates per cell or 127 SHC denotes 12 volts, 7 plates per cell.

5. The electrolyte density at the end of fifty-two hours charge should be near 1.290 specific gravity. A variation between 1.285 and 1.300 is permissible. If, after fifty hours of the initial charge, the electrolyte density of any of the cells is outside these limits, adjustment should be begun while still charging. For those cells in which the density is higher than 1.300 specific gravity replace some of the electrolyte with distilled water. In those cells where the density is lighter than 1.285 specific gravity replace some of the electrolyte with previously prepared electrolyte of 1.400 specific gravity. Wait until the cells have charged one hour before taking readings to determine the effect of adjustment, which, if not accomplished, should be attempted again as before. Practice Will enable the attendant to estimate the amount of electrolyte necessary to replace in order to accomplish the proper density desired-at the end of initial charge.

6. Following the completion of the fifty-two hour charge, if there is time to do so, it is good practice to put the battery through a development cycle, i. e., to discharge it at about the four-hour rate and then put it on the charging line again at the normal rate until a condition of full charge is again reached. The objects gained by this discharge are:

(a) Further development of the plates.

(b) Adjustment or stabilization of the electrolyte.

(c) Checking the a.s.sembly by noting the failure of any cell or cells to act uniformly and satisfactorily during discharge.

The four-hour discharge rate is, of course, like the normal rate of Initial Charge, dependent upon the size and number of plates per cell in any particular battery; the number of cells determines the voltage only and has nothing to do with the battery's charge or discharging rating. These four-hour discharge rates are as follows:

Plates per Cell Type of Plate AHS WHN RHN SHC BHN JFN GM CLN KPN -------- --- --- --- --- --- --- -- --- --- 3 3 5 5 5 5.5 6.5 7 7.5 7.5 8 10 7.5 13.5 9 10 10 11 13 18 11 12.5 12.5 14 16 19 12.5 22.5 13 15 15 16.5 19.5 22.5 15 27 27 15 17.5 17.5 19 23 26 17.5 31.5 17 22 26 19 22.5 22.5 25 29 22.5