Yuasa YUMICRON YUA00ACC04 Manuel d'utilisateur télécharger pdf (Page 20)

Battery Testing

Methods of Checking Battery Condition

State of Syringe Digital 5-Ball

Charge Hydrometer Voltmeter Hydrometer

100% Charged

w/Sulfate Stop 1.280 12.80v 5 Balls Floating

100% Charged 1.265 12.60v 4 Balls Floating

75% Charged 1.210 12.40v 3 Balls Floating

50% Charged 1.160 12.10v 2 Balls Floating

25% Charged 1.120 11.90v 1 Balls Floating

0% Charged less than 1.100 less than 11.80v 0 Balls Floating

POINTS TO REMEMBER

❐ Use a voltmeter or hydrometer to test state of charge.

❐ In extreme cold or heat, you’ll have to adjust hydrometer readings.

❐ Battery can be tested with or without electrical load applied.

❐ Unloaded testing is simplest.

❐ Applying a load and reading voltage at battery is more accurate.

A battery’s specific gravity changes with temperature.

Ideally, readings should be taken at 77°F. Is it really

going to matter if you’re off a couple of degrees one way

or another? Probably not. If you’re working somewhere

that’s uncomfortably hot or cold, it’s time to use the old

conversion factors: add .001 to the specific gravity read-

ing for each 3°F above 77°F or subtract .001 from the

specific gravity reading for each 3°F below 77°F. Cell

voltage can be found by adding .84 to the specific gravity.

Note, too, that YUASA’s “Sulfate Stop,” a chemical addi-

tive that increases battery life by drastically reducing sul-

fate buildup, changes the specific gravity readings; they’ll

be higher than with ordinary batteries.

Test sealed VRLA types with a voltmeter or

multimeter. If the stabilized open circuit voltage is

below 12.5v, the battery needs charging. For a stabilized

open circuit reading, first allow the battery to remain in

an open circuit condition for at least 1 - 2 hours.

LOADED TESTING: There are two types of loaded tests

for motorcycle batteries. You’ll need a voltmeter or multi-

meter.

Low-load test: Basically, this means turning on the

bike’s lights and taking a voltage reading at the battery.

Remember, hook positive (+) to positive (+), negative (-) to

negative (-). The battery in a 12v system should have at

least 11.5v DC with the lights on. A 6v system should

have at least 5.75v DC. If voltage drops below these lev-

els, it’s time to charge.

High-rate discharge test: This is the best test of bat-

tery condition under a starting load. Use a load testing

device that has an adjustable load. Apply a load of three

times the ampere-hour rating.

At 14 seconds into the test, check battery voltage: a

good 12v battery will have at least 10.5v, and a good 6v

battery, at least 5.25v. If the reading’s low, charge.

There are two types of battery tests: unloaded and

loaded. An unloaded test is made on a battery without

discharging current. It’s simplest and most commonly

used. If you need a precise reading, loaded testing is the

answer. It’s more accurate.

UNLOADED TESTING: Check charge condition using

either a hydrometer or voltmeter. With a voltmeter,

voltage readings appear instantly to show the state of

charge. Remember to hook the positive lead to the

battery’s positive terminal, and the negative lead to the

negative terminal.

A hydrometer measures the specific gravity of each cell.

The specific gravity tells the degree of charge;

generally, a specific gravity of about 1.265 to

1.280 indicates a full charge. A reading of 1.230

to 1.260 indicates the battery should be charged before

testing. The chart below shows the charge level as

measured by syringe float hydrometer, digital voltmeter

and five-ball hydrometer.

SECTION

Inspecting, Testing

and Charging

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Yuasa YUMICRON YUA00ACC04 Manuel d'utilisateur Page 20

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