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 (FIC), 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 REC-
OMMENDED.
Find your battery's rating on the chart below and note
the charge time given for each charger setting. The
times given are for batteries with a 50-percant charge
prior to recharging. Add more time for severely dis-
charged batteries.
SMALL
BA'I-FERIES
CAFIFFRUCKS
Motorcycle, garden
tractor, etc.
2OO- 315 CCA
315 - 55O CCA
550 - 1000 CCA
MARINE/DEEP CYCLE
6-12AH
12 - 32 AH
4O - 60 RC
60 - 85 RC
85 -190 RC
80 RC
140 RC
160 RC
180 RC
2-4
4-10
11 -14
14 -18
18 - 35
18
27
30
33
NR
NR
2 - 27/8
27/8.33/4
33/4- 7
31/2
51/2
6
7
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.
1.265 100% 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 bdng your battery to a full
charge.
To convert Reserve Capacity to Amp Hours, divide
Reserve Capacity by 2, and add 16:
Amp Hours = _ +16
2
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).
• Multiplythe Amp Hour rating by the charge needed
(.50) and divide by the charger setting
(2 or 10 amps).
• Multiplythe 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:
AmD Hour Ratino x charoe needed x 1.25 :
hours
Charger Setting of charge
100 fAH Ratlno_ x .50 (char oe needed_ x 1.25 :
6.25
10 (Charger Setting) hours
100 x.50 : 5 x 1.25 : 6.25
10
You would need to charge your 100-Ampere Hour
Battery for approximately 6¼ hours at the 10-Amp
charge rate using the above example.
8
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