Schumacher 85-8100 Multiple Battery Charging, Starter and Charging Systems Test Procedures

120 minutes + 15.5 = 75.5 amp hours *

2

(75.5 amp hours) x (0.75) = time = 1.4 hours 40-amp charge rate

*NOTE: The NAPA 85-8100 calculates the amp hours for you, visible on the display panel.

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.).

Example of Parallel Connection

14. STARTER AND CHARGING SYSTEMS TEST PROCEDURES

14.1 If doing both tests, the Starter test must run first, 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.

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