Duoyi DY219 Operating Manual - Page 9

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the internal resistance by the formula.

Disadvantages of this method:

(1) Just available for large capacitance battery or storage battery. The small

capacitance battery can not load 40-80A large current in 2-3 seconds.

(2) When the large current going through the battery, there comes out

polarization phenomenon from internal electrode, which can cause

polarization internal resistance. As a result it has to be tested in a short time.

Otherwise there is a large error of the internal resistance value.

(3) The internal electrode will be damage generally when large current go

through the battery.

The method of this tester:Battery is actually equivalent to an active

resistance. So we add a fixed frequency and small current to it, and then

sample the voltage value. Eventually the internal resistance can be figured

out after some operation such as rectificationand smoothing.

Advantages of this method:

(1) It can be used for checking almost all the batteries including low capacity

battery and internal resistance of the notebook battery exclusively.

(2) It will not harm the battery to use this method.

7. Specification Of Storage Battery

The data in the table is just for reference. Actual value must be referredto the

manufacturer.

7-1．JIS translation table

Battery

CCA

NEW JIS

OLD JIS

CMF

26A17R

200

26A17L

200

26A19R

12N24-4

200 220 264

26A19L

12N24-3

200 220 264

28A19R NT50-N24 250

28A19L NT50-N24L 250

32A19R NX60-N24 270

295

Battery

CCA

NEW JIS

OLD JIS

55B24RS

NT80-S6S

430

420

55B24LS

NT80-S6LS

430

420

55D26R

N50Z

350

440

55D26L

N50ZL

350

440

60D23R

520

60D23L

520

65D23R

420

540

75% 12.54V

50% 12.30V

25% 12.12V

Totally discharged 11.94V

CCA value 588CCA

Determine The Condition of Battery.

For 12/24V system in use of 24V test mode, CCA value refers to 1/2

value of the one set of two 12V series connection batteries.

Internal resistance 4.75mΩ

The higher of the CCA value , the lower of the internal resistance

normally.

Note: Different material of the battery produced by various

manufacturers can cause different internal resistance. So there is no fixed

standard. But there is little difference among the internal resistance of the

battery with the same model from the same manufacturer.

For 12/24V system in use of 24V test mode, internal resistance value

refers to total value of the one set of two 12V series connection batteries.

Life: Display the condition of the battery. Suggest replacing the battery

when it shows below 45%.

<45%

◆ Suggest replacing

CMF

The result indicates the battery is bad

500

and remains 32% of life. So suggest replacing

525

the battery.

525

◆ Life check OK, and voltage check low

The result indicates the battery is

580

good and full of 100% of life. But only 12.11V

75%

12.42V

50%

12.24V

25%

12.06V

Totally discharged 11.88V