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12. CALCULATING CHARGE TIME
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.
Example:
Amp hour rating = Reserve capacity + 16
NOTE: The Reserve Capacity can be
obtained from the battery's specification
sheet or the owners manual.
To calculate the time needed for a charge:
1. Find the percentage of charge needed.
2. Multiply the Amp hour rating by the
charge needed, and divide by the
charge rate.
3. Multiply the results by 1.25 to find the
total time needed, in hours, to bring
the battery to full charge.
4. Add an additional hour for a deep-cycle
battery.
BATTERY SIZE/RATING
SMALL
Motorcycle,
BATTERIES
garden tractor, etc.
200-315 CCA
CARS/
315-550 CCA
TRUCKS
550-1000 CCA 85-190 RC
MARINE/DEEP CYCLE
13. MAINTENANCE AND CARE
A minimal amount of care can keep your
battery charger working properly for years.
• Clean the clamps each time you are
finished charging. Wipe off any battery
fluid that may have come in contact with
the clamps to prevent corrosion.
• Occasionally cleaning the case of the
charger with a soft cloth will keep the
finish shiny and help prevent corrosion.
All manuals and user guides at all-guides.com
2
1.5 A
6-12 Ah
2¾-5 h 2-3¾ h
5-
12-32 Ah
13¼ h
15-
40-60 RC
19¼ h
19¼-
60-85 RC
24½ h
24½-
46¼ h
80 RC
23½ h 17½ h
140 RC
36 h
160 RC
40 h
180 RC
44 h
Example:
Ah rating x % of charge needed x 1.25 = hrs of charge
Charger Amp setting
100 (Ah rating) x .50 (charge needed) x 1.25 = 3.125 hrs
20 (Charger Setting)
100 x .50 x 1.25 = 3.125
20
You need to charge a 100 Ampere hour
battery for a little more than 3 hrs at the 20
Amp charge rate, using this example.
Use the following table to determine the time
it will take to bring a battery to full charge.
Ah – Ampere Hours
NR – the charger setting is NOT
RECOMMENDED.
CCA – Cold Cranking Amps
RC – Reserve Capacity
The times given are for batteries with a
50% charge prior to recharging.
CHARGE RATE/CHARGING TIME
2A
4A
10A
15A
1-2 h
NR
NR
3¾-
2-5 h
NR
NR
10 h
11¼-
5¾-
2¼-3 h 1½-2 h ¾-1¼ h ¾-1 h
14½ h
7¼ h
14½-
7¼-9 h 3-3¾ h 2-2½ h
18¼ h
18¼-
2½-
9-17½ h 3¾-7 h
34¾ h
4½ h
8¾ h
3½ h
2¼ h
27 h
13½ h
5½ h
3½ h
30 h
15 h
6 h
4 h
33 h
16½ h
6½ h
4½ h
• Coil the input and output cords neatly
when storing the charger. This will help
prevent accidental damage to the cords
and charger.
• Store the charger unplugged from the AC
power outlet in an upright position.
• Store inside, in a cool, dry place. Do not
store the clamps on the handle, clipped
together, on or around metal, or clipped
to the cables.
• 9 •
25A
30A
35A
40A
NR
NR
NR
NR
NR
NR
NR
NR
40-50
½-¾ h
min
1¼-
50-60
1-1¼ h
¾-1 h
1½ h
min
1¼-
1½-3 h
1-2 h
1-1¾ h
2¼ h
1½ h
NR
NR
NR
2¼ h
NR
NR
NR
2½ h
NR
NR
NR
2¾ h
NR
NR
NR
60A
NR
NR
23-29
min
29-37
min
37-70
min
NR
NR
NR
NR
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