SAFETY
9
PARTS
MAINTENANCE
TROUBLESHOOTING
OPERATION
CALCULATING CHARGE TIME
The Chart Method
Use the following table to more accu-
rately 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 Capac-
ity (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
below 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.
BATTERY SIZE/RATING
Motorcycle, garden
tractor, etc.
200 - 315 CCA
315 - 550 CCA
550 - 1000 CCA
6-12AH
12 - 32 AH
40 - 60 RC
60 - 85 RC
85 -190 RC
80 RC
140 RC
160 RC
180 RC
2 AMP
2 - 4
4 - 10
11 - 14
14 - 18
18 - 35
18
27
30
33
CHARGE RATE/CHARGING TIME - HOURS
SMALL
BATTERIES
CAR/TRUCKS
MARINE/DEEP CYCLE
The Hydrometer or Electronic Method
To find the time needed to fully charge your battery, determine the battery’s charge
level with a hydrometeror electronic Percent-of-Charge Tester. The following table
will help you convert hydrometer readings to percent of charge values.

SPECIFIC PERCENT PERCENT OF

GRAVITY OF CHARGE CHARGE NEEDED

1.265 100% 0%

1.225 75% 25%

1.155 25% 75%

1.120 0% 100%

Continued...
6 AMP

NR

NR

4 - 5

5 - 6

6 - 12

6

9

10

11