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120 minutes + 15.5 = 75.5 amp hours *
2
(75.5 amp hours) x (0.75) = time = 1.4 hours
40-amp charge rate
Then: (1.4 hours) x (recharge factor of 1.25) = 1.76 hours or 106 minutes recharge time.
13. MULTIPLE BATTERY CHARGING
13.1 PARALLEL CHARGING
Batteries of the same type and voltage rating may be connected in parallel for maintenance charging.
Charge time increases in proportion to the number of batteries. Rate of charge decreases in the same
proportion.
Example: Charging two batteries in parallel will take twice as long, since each battery receives one-half
the amount of charge showing on the ammeter.
Thus, if the ammeter shows a 40-amp charge, each battery will be getting a 20-amp charge (assuming
both batteries have a similar rating, state-of-charge, etc.).
14. STARTER AND CHARGING SYSTEMS TEST PROCEDURES
14.1 If doing both tests, the Starter test must run rst, before the Alternator test.
Ensure that the charger remains UNPLUGGED for the entire duration of either test.
Plugging in the charger will automatically start charging the battery, and suspend the Starter or
Alternator test in progress. Any charging current detected will make the FAIL LED come on by
default, and invalidate test results.
NOTE: Starter and Alternator tests will become disabled and not run while
charging is taking place.
* NOTE: The NAPA 85-8100
calculates the amp hours for you,
visible on the display panel.
Example of Parallel Connection