Automotive Service Modern Auto Tech Study Guide Chapter 28 & 29 Pages 473 - 497 Batteries 46 Points

Automotive Service A ______________ is an electrochemical device that produces & stores __________ ____________ (DC) electricity. Charging system output must also be DC in order to recharge a battery Battery Alternator Capacitor Direct Current Alternating Current Eddy Current

Automotive Service Repeated, heavy ____________________ (current flowing out) and ____________________ (current flowing in) of a battery is called “cycling” the charge. If this process happens too often, the battery will be ruined. Discharging, Recharging

Automotive Service Batteries operate the electrical systems during _____________ & (starting) and whenever the engine is off. Cranking Jumping Stomping

Automotive Service As the engine runs, the ______________ system supplies vehicle electrical needs & recharges the battery. Starting Ignition Charging

Automotive Service Battery negative plates are made of porous ________ and positive plates are made of lead _____________ alloyed with calcium or antimony to increase performance & decrease gassing (acid fume formation). Lead, Peroxide Sponge, Oxide Plastic, Sulfate

Automotive Service Within the polypropylene battery case, ____________________ keep the positive & negative plates from touching each other. This would internally “short circuit” the battery & ruin it. Capacitors Separators Mufflers

Automotive Service The ____________ gas around a battery is explosive and the battery electrolyte is acidic & corrosive! Oxygen Nitrogen Hydrogen

Automotive Service 8. ____________________ is the mixture of acid & water in a lead-acid battery. Electrolyte Gatorade Distilled Water

Automotive Service 36% H2SO4 64% H2O 9. Battery electrolyte is made up of ____% _____________ ________ (H2SO4) & ____% _________ (H2O). 36% H2SO4 64% H2O

Automotive Service

Automotive Service Vehicle battery cables connect to either the ______ posts or the ______ terminals on a battery. Top, Side

Automotive Service Black = Negative Red = Positive The battery cable color code is: ____________ = negative ________ = positive. Black = Negative Red = Positive

Automotive Service Internally, batteries have ____ cells (each with ≈ 2 volts) connected in series (+ to -) to produce ____ volts. 3, 12 6, 12 12, 12

Automotive Service For heavy duty use, like in snow plow trucks, 2 batteries connected in ________________ (+ to +) will provide more current output but still keep the system operating with 12 volts. Series Parallel Series-Parallel

Automotive Service Batteries last longer if they are properly held down, to prevent __________________ and if they are kept insulated from excess, under the hood __________. Movement, Heat

Automotive Service 15. A _________________ - free battery does not use removable filler caps. Maintenance Lead Sodium

Automotive Service 16. A ____ battery is a lead-acid battery with electrolyte in a paste like consistency. Gel Jello Hello

Automotive Service 17. An _____________ _______ _____ battery (AGM) contains fiber matting that holds the liquid electrolyte. Absorbed Glass Mat Absorbed Gas Mask Ambient Gel Manager

Automotive Service 18. The SAE & BCI have established the ______ ___________ _____ (CCA) rating for batteries. CCA is the amount of current (amps) a battery can deliver for 30 seconds at 0ºF & remain above 7.2 volts. Cold Cranking Amp Hot Cranking Amp Boiling Cranking Amp

Automotive Service 19. The _____________ _______________ rating indicates the time it takes to drop voltage below 10.2 volts from a full charge at a discharge rate of 25 amps and an ambient temperature of 80 degrees. Reverse Capacity Revere Capacity Reserve Capacity

Automotive Service 20. A ________ battery won’t produce as much current as warm one. At 0ºF a battery has only ___% power. 80 Fº is optimal for a battery Warm, 25% Cold, 40%

Automotive Service 21. A ________________________ load is any current draw present when all electrical devices are shut off…”key – off”. Parasitic Static Dynamic Amps

Automotive Service ~~~ 22. If a battery case is dirty, clean it with _________________ ________ and water to neutralize the acid.

Automotive Service 23. When using a ________ meter to determine OCV always connect the red lead to the ______________ battery post or terminal and connect the black lead to ________________ battery post or terminal . Volt, Positive, Negative Ohm, Negative, Positive Watt, Positive, Negative

Automotive Service 24. “Tech Tip” When disconnecting a battery for service, use a ______________ saver connected to the interior power plug (cigarette lighter) to keep power going to the computer’s Random Access Memory. Sight Memory Time

Automotive Service Batteries that are not maintenance free should have _______________ water added if electrolyte is low. Q? What is distilled water? Simple Answer: Distillation is a process of water evaporating, condensation and precipitating. In nature, this process is known as the hydrologic cycle. Water is heated to its boiling point, and the resulting steam is captured to form pure distilled water.

Automotive Service A _____________________ is a tool used to measure specific gravity, which is the weight or density of the electrolyte as compared to the weight or density of water. Manometer Thermometer Hydrometer

Automotive Service Fully charged batteries should have hydrometer readings of at least ________ times heavier than water 1.265 to 1.300 1.100 to 1.200 0.900 to 1.000

Automotive Service Specific ______________ should not vary more than 25 to 50 “points” between cells. (.025 to .050) Gravity Pressure Vacuum

Automotive Service Specific Gravity of Water is very steady at 1.000

Automotive Service A battery _________ is a machine used to recharge a low or dead battery. Never attempt to recharge or jump start a totally discharged, frozen battery! Jumper Charger Packer

Automotive Service It‘s possible to ________ _________ a vehicle w/dead battery by connecting it to a vehicle w/good one. Push Start Bump Start Jump Start

Automotive Service Jumper cables or packs get connected from the _______________ of the good battery to the positive of the dead battery & from the ________________ of the good battery to the negative of the dead battery.

Automotive Service 32. When disconnecting a battery for service, ALWAYS remove the _______________ cable first. Remove Negative Cable First!

Automotive Service 33. When disconnecting a battery for service, ALWAYS replace the _______________ cable last. Replace Negative Cable Last! Ground Symbol

Automotive Service 34. When servicing a battery, ALWAYS use ______________ tools to prevent shorts. Stainless Steel Insulated Quality

Automotive Service During a Quick (3 Minute) Charge Test, if the voltage goes above ______ volts, the battery is junk. 6 Volts 12 Volts 15 Volts

Automotive Service Voltage Drop Test of Cable-to-Post Connection – Should be Zero VD

Automotive Service Positive To Negative To Jump Starting Cable Connection Sequence