1. Battery Service
Chapter 31
Page 413

2. Charging and Discharging batteries gives off Don’t make sparks or have
Hydrogen Gas---
Very Flammable—
Don’t make sparks or have
open flame!
The Hindenburg
Was Filled With
Hydrogen!!!!!

3. Check Battery’s Condition
Date of Manufacture
Case Condition – swelling, leaking, cracks, melting
Cables, clamps, battery tray, and hold downs.
Level of Electrolyte- check Magic eye (maintenance free), look at the side of case- (sometimes you can see level through side), remove caps and check levels.
Low
Good Bad Electrolyte
Magic Eye

4. Remove, Service, and Replace Battery

5. Refilling Battery with Water
Use clean filter water only- distilled water is the best.
When levels are low, it is down on water. *Electrolyte doesn't evaporate.*
Look carefully at the opening- there will be a line inside the opening that indicates proper level.

6. Cleaning Terminals and Clamps
Lead oxidation (black)
Corrosion (white powder)

7. Sprays and Terminal Cleaner

8. Cleaning Case Tray and Stray Acid
A mix of baking soda and water will neutralize the acid. A 50/50 mix usually works well.
Remove the battery
and clean the tray, case,
posts, cables, and clamps.

9. Removing and Replacing Battery
Shut off all electronics in the vehicle- this will reduce the chance for sparks.
Remove NEGATIVE clamp FIRST then the positive next.
Service battery-clean, replace water, etc
Replace POSITIVE clamp FIRST the then negative
(Negative off first-----Negative on last)

10. Battery Tools
Clamp Puller
Hydrometer
Don’t use hammer!

11. More Tools Computer Memory Tool--- 9 volt battery
Keep all electronics off
Clamp Spreaders
Clamp Bolt Pliers
Battery Carrier

12. Final Result

13. SPECIFIC GRAVITY of ELECTROLYTE
Hydrometer Tests
SPECIFIC GRAVITY of ELECTROLYTE
100% charge 1.265
75% charge 1.239
50% charge 1.200
25% charge 1.170
fully discharged 1.110
at 75 degrees
(Specific Gravity =Weight)

14. Voltage Test

15. Battery Testing

16. Jump Starting Safety - - + +
Need Heavy Cables--- Those tread-thin emergency type are not good enough.
Set up as follows: + + - - +

17. Jump Starting

18. Battery Drain Test Test for key-off drains (parasitic drain)
Place amp meter in series
Make sure all lights,
electronics, etc. are off.
No more that 50 milli amps
Test light substitute---
Should not light
*hood, trunk, glove box?

19. Battery Leakage Test Place one clip on positive terminal
Place other lead over all suspected places on battery you think may be acid.
Voltage on meter =Leak

20. Your Job.
Complete chapter Questions 1-10 (review) and 1-5 (ASE-style). Page 430
Write on a separate paper and write out the complete question and your answer. ( do not write the other answer options).
Complete the chapter worksheet (I will give it out). You may write on it.
File all items in your note book.
Notebooks will be graded in the future.