LENGTH OF CHARGE
The following instruction will allow you to determine how long it will take to bring a specific battery to full charge.
1. Test the battery for state of charger with a
hydrometer or electronic percent-of-charge tester.
2. Determine the size of the battery in Amp-Hour or
Reserve Capacity. If the ratings are not printed on
the battery, contact your local battery dealer for
this information. These are the only ratings that can
be used to determine length to charging time.
3. Use the battery rating, the charge level of the
battery, and amp setting to be used on the charger
in the formula provided below.
4. If the battery is rated in Reserve Capacity, use the
following formula to convert reverse capacity to
amp-hours.
NOTE: The length of charge times are approximate
and vary from the battery to battery. Always follow the
battery manufacturer’s specific charging instructions.
Amp Hour Rating of Battery ×
Percent of Charged Needed
Amp Setting Selected on Charger
= Hours to Charge
Reserve Capacity
2
+15.5 = Amp-Hour Rating
CHARGING RATE/TIME
Table B
Battery Size/Rating
12V Charge Rate
Charging Time (based on battery at 50% charge)
2A 10A 40A Boost
Small batteries
(Motorcycle, Garden Tractor, etc.)
6-12 Ah 3 -6 hr
Do not use these rates
for small batteries
Cars/Trucks
200-315 CCA 40-60 RC 13 - 20 hr 2 1/2 - 4 hr 1/2 - 3/4 hr
315-550 CCA 60-85 RC 20 - 35 hr 4 - 7 hr 3/4 - 2 hr
550-875 CCA 85-125 RC 35 - 55 hr 7 - 11 hr 2 - 3 hr
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