Sears 28.71234 Amp Hours = Reserve Capacity +, Specific Gravity Percent of Charge Needed

			CHARGE RATE/
BATTERY SIZE/RATING			CHARGING TIME - HOURS
			2 AMP	20 AMP	60 AMP
SMALL	Motorcycle, gar-	6 - 12 AH	2 - 4	NR	NR
BATTERIES	den, tractor, etc.	12 - 32 AH	4 - 10	NR	NR
	200 - 315 CCA	40 - 60 RC	11 - 14	60 - 90	20 - 30
				min.	min.
CAR/TRUCKS	315 - 550 CCA	60 - 85 RC	14 - 18	90 - 120	30 - 40
				min.	min.
	550 - 1000 CCA	85 - 190 RC	18 - 35	2 - 3.5	45 - 60
				hrs.	min.
		80 RC	18	105 min.	NR
		140 RC	27	2 hrs.,	NR
MARINE/DEEP CYCLE				45 min.
		160 RC	30	3 hrs.	NR
		180 RC	33	3.5 hrs.	NR

14.2 The Hydrometer or Electronic Method

To find the time needed to fully charge your battery, determine the bat- tery’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.

SPECIFIC GRAVITY	PERCENT OF CHARGE	PERCENT OF CHARGE
		NEEDED
1.265	100%	0%
1.225	75%	25%
1.155	25%	75%
1.120	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

2

NOTE: The Reserve Capacity can be obtained from the battery specifica- tion sheet or the owner’s manual.

To calculate time needed for a charge:

•Find the percent of charge needed. (A battery at 50 percent charge that

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