Battery Percent And Charge Time; Maintenance And Care; Troubleshooting And Error Codes - Schumacher Electric DSR127 Owner's Manual

13. BATTERY PERCENT AND CHARGE TIME

This charger adjusts the charging time in order to charge the battery completely, efficiently and safely.
The duration of the charging process depends on three factors:
Battery State
If a battery has only been slightly discharged, it can be charged in less than a few hours. The same battery
could take up to 10 hours if very weak. The battery state can be estimated by using the built-in tester. The
lower the reading, the longer charging will take.
Battery Rating
A higher rated battery will take longer to charge than a lower rated battery under the same conditions. A battery
is rated in Ampere-Hours (AH), Reserve Capacity (RC) and Cold Cranking Amps (CCA). The lower the rating,
the faster the battery will charge.
Battery Size
The charger automatically selects a charge rate up to 12 amps. The charger charges at the selected charge
rate and eventually reduces the charge rate in a controlled manner. After the charging process has started,
the digital display can be used to determine the charging progress by selecting the % (Battery %) mode.
Important facts to keep in mind when charging a battery:
• When the display indicates 77% charged, the battery has been charged enough to start most vehicles.
• The battery % shown in tester mode is an estimate based on the battery voltage and a scale set by the
Battery Council International. The battery % shown in charger mode is an estimate of the relative charge
in the battery compared to the charge it should have if the charging process is allowed to complete.
• The battery % shown in tester mode can be used to estimate the relative charge time. The lower the %
shown, the longer the charge time for a given battery.
• The battery % shown in charger mode is an indication of the relative progress of the charging process.
The higher the battery % displayed, the less charge time remains.
• The more a battery is discharged, the faster it absorbs a charge from the charger. That means that the
battery % increases faster at the beginning of the charging process than at the end. In other words, it
takes longer for a battery to accept the last few percent of the charge than the first several percent.

14. 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.
• 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.

15. TROUBLESHOOTING AND ERROR CODES

Error Codes
CODE
The battery voltage is still under 10V
F01 (for a 12V battery) or 5V (for a 6V
battery) after 2 hours of charging.
The charger cannot desulfate the
F02
battery.
The battery was unable to reach the
F03
"full charge" voltage.
DESCRIPTION REASON/SOLUTION
The battery could be bad. Have it checked or replaced.
The battery could not be desulfated; have it checked or
replaced.
Have the battery checked or replaced.
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