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C. Testing the BatteryC1 High Rate Discharge Testing(Battery must be greater than 12.5Volts before commencing C High Rate Testing)C High Rate Discharge TestingC1.0 Good HighRateIs the High RateTest Result good?YESREJECT CLAIMBattery serviceableNOC2.0 InternalConnector Fault vsServiceDeteriorationDid the battery voltage fallimmediately to 0 Volts?NOYESACCEPT CLAIMInternal Connection breakREJECT CLAIMService DeteriorationNoteIf the battery is identified as over discharged, then attempt to recharge, however if the battery has been left in a low state of charge for along period there is less chance of recovery and subsequent deposition of sulphate within the separators will lead to soft short circuits.Battery may be undercharged or overcharge due to faults within the vehicle electrical system This is not a fault of the battery and thevehicle electrical system should be checked.Battery Testing512
How a Battery WorksWhat Is a Battery?A battery is a device for storing electrical energy in a chemicalform, and then releasing it as direct current in a controlled way.All types of batteries contain a positive and a negative electrodeimmersed in an electrolyte, the whole assembly being within acontainer.All Yuasa batteries are lead-acid batteries, which means thatthey have positive and negative electrodes made of leadcompounds in a dilute sulphuric acid electrolyte.Lead-acid batteries are secondary batteries, which means thatthey can be recharged after they have been discharged.Primary batteries can be discharged only once and then haveto be thrown away; examples are some types of torch andradio batteries.How a Yuasa Battery WorksThe positive electrode is made of lead dioxide and the negativeelectrode is made of porous lead.When an electrical load (for example lights or a starter-motor) isconnected across the battery, a current flows through theelectrolyte in the battery and through the external load. Thiscauses the battery to discharge, which results in the chemicalcomposition of both the electrodes changing to lead sulphate.A battery can be charged by putting a current through thebattery from an outside source of electricity such as analternator, dynamo or charging unit. This converts the leadsulphate back to the original materials of lead dioxide andporous lead.As the battery becomes charged, the electricity begins todecompose (hydrolyse) the water in the electrolyte into itsconstituent elements of hydrogen and oxygen, which arereleased as gas. This is why a battery gases when it is charged.What is a Battery Made of?GridsAs the positive and negative electrodes are made of weakmaterials, they need a mechanical support which is providedby a grid made from a lead alloy; lead on its own would be toosoft.In addition to providing a support for the electrodes (the activematerial), the grid also conducts electricity from the electrodesto the outside load.ElectrodesThe electrodes are initially made from a mixture of lead oxideand lead sulphate. This is converted into lead dioxide in thepositive plate and porous lead in the negative plate when thebattery is initially charged.The negative electrode also contains small amounts ofadditives to give the battery a good discharge performance atlow temperatures to improve starting.The combination of grid and electrode is normally called aplate.ElectrolyteThe electrolyte is dilute sulphuric acid. This acts as a conductorto transport electrical ions between the positive and negativeplates when the battery is being charged or discharged.The acid also takes part in the discharge as the sulphate ionsreact chemically at the electrodes to produce lead sulphate.SeparatorThe separator is an insulator placed between the positive andnegative plates to prevent them shorting together.The separator needs to be microporous with very small holes toallow the ions to flow through the separator from one plate toanother. It also needs to be able to resist the high temperaturesand strongly acidic oxidising conditions that occur in a battery.Most modern separators are made of microporouspolyethylene, which has the right properties to meet thedemanding conditions within the battery.Container and LidThese are normally made of polypropylene, which is a light butstrong plastic. Unlike some plastics, it does not become brittlewhen it is cold, and so can resist knocks during handling. It isnot attacked by acid and it can also withstand the fluids (petrol,diesel, brake-fluid, antifreeze) normally found on a vehicle.What Makes a Battery Maintenance-Free?30 years ago, batteries lost water at a high rate, and motoristswere advised to check the acid level as one of their weeklychecks; modern maintenance-free batteries need no wateraddition throughout their life under normal operatingconditions. Incidentally, during the same period, battery life hasdoubled from 2 years to 4-5 years.In the past, battery grids were made of an alloy of lead with 10per cent of antimony; the purpose of the antimony was to giverigidity as pure lead would be too soft on its own. Unfortunately,some of the antimony dissolved in the acid and resulted in thebattery losing water.With improvements in battery technology, we have been ableto reduce the antimony content from 10 per cent to 1.5 percent, and this reduction has resulted in batteries that are lowmaintenance, needing only yearly attention.The latest improvement has been the use of 0.1 per cent ofcalcium as a hardening agent in grids in place of antimony; thiscauses less contamination of the acid and much reduced waterloss, making the battery maintenance-free so no water needsto be added during its operational life.InformationYUASA - The world's leading battery manufacturer513
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CV, PSV, LCV,Agricultural & PlantBa
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ContentsThe Range Explained 2 - 3Au
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Battery SpecificationsSpecification
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Battery Specifications continuedSpe
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BBMS to Yuasa Cross ReferenceUK Ref
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JIS to Yuasa Cross ReferenceJISRefe
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DIN to ETN to Yuasa Cross Reference
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Introduction to Application Guides
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Page 507 and 508: Battery Characteristics & Fault Dia
Page 509 and 510: Battery TestingA. Visual CheckA1.0
Page 511 and 512: YESA. Visual CheckA1.0 WarrantyPeri
Page 513: B2. Testing the BatteryB2 Conventio
Page 517 and 518: Understanding the SpecificationsYua
Page 519 and 520: Understanding the Specifications co
Page 521 and 522: Health & Safety Information continu
Page 523 and 524: All You Need To Know About Batterie
Page 531 and 532: AGM Explained continuedSilver State
Page 533 and 534: Material Safety Data continuedIssue
Page 535 and 536: Also available batteries for ATVs,
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