DieHard 200.71312 Owner's Manual download pdf (Page 9)

Calculating charge time

The Chart Method

Use the following table to more accurately determine

the time it will take to bring a battery to full charge.

First, identify where your battery fits into the chart.

Small batteries- motorcycles, garden tractors, etc.

-- are usually rated in Ampere Hours (AH). For

example; 6 to 12 AH, or 12 to 32 AH.

Batteries in cars and smaller trucks are usually rated

in Reserve Capacity (RC), Cold-Cranking Amps

(CCA), or both.

Marine, or deep-cycle batteries are usually rated in

Reserve Capacity (RC).

• NR means that the charger setting is NOT

RECOMMENED.

Find your battery's rating on the chart to the right and

note the charge time given for each charger setting.

The times given are for batteries with a 50-percent

charge prior to recharging. Add more time for severely

discharged batteries.

SMALL

BATTERIES

CAR/TRUCKS

Motorcycle, garden

tractor, etc.

200 - 315 CCA

315 - 550 CCA

550 - 1000 CCA

MARINE/DEEP CYCLE

6-12AH

12-32 AH

40 - 60 RC

60 - 85 RC

85 -190 RC

80 RC

140 RC

160 RC

180 RC

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2-4

4-10

11 -14

14-18

18-35

17/8- 2V2

21/2- 3

3 - 53/4

4V2

51/2

The Hydrometer or Electronic Method

To find the time needed to fully charge your battery,

determine the battery's charge level with a hydrometer

or electronic Percent-of-Charge Tester. The following

table will help you convert hydrometer readings to

percent of charge values.

1.265

1.225

1.155

1.120

100% 0%

75% 25%

25% 75%

0% 100%

When you know the percent of charge and the Amp

Hour (AH) rating of your battery, you can calculate the

approximate time needed to bring your battery to a full

charge.

To convert Reserve Capacity to Amp Hours, divide

Reserve Capacity by 2, and add 16:

Amp Hours = Reserve Capacity + 16

To calculate time needed for a charge:

• Find the percent of charge needed. (A battery at

50 percent charge that will be charged to 100

percent needs another 50 percent (.50).

• Multiply the Amp Hour rating by the charge

needed (.50) and divide by the charger setting

(2 or 12 amps).

• Multiply the result by 1.25 and you'll have the

approximate time needed, in hours, to bring the

battery to full charge.

• Add one additional hour for a deep-cycle battery.

Example:

Amp Hour Rating x charqe needed x 1.25 = hours

Charger Setting of

charge

100 (All Rating) x .50 (charge needed) x 1.25 = 5.2

12 (Charger Setting) hours

100 x .50 = 4.167 x 1.25 = 5.2

You would need to charge your lO0-Ampere Hour Bat-

tery for a little more than 5 hours at the 12-amp rate

using the above example.

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DieHard 200.71312 Owner's Manual Page 9

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