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APPENDIX A - CHARGING TIMES
To calculate the approximate charging time required to fully charge a battery, it is necessary to determine
the specific gravity (or, percent of battery charge) using a hydrometer. Use this technique, if battery vent
caps can be removed. Check each cell. If there is one cell with a very low specific gravity compared to
the other cells, there is probably a shorted cell in the battery. Replace the battery.
The following chart converts hydrometer readings into percent of charge values.
Specific Gravity Percent of Charge Percent of Charge Needed
(Hydrometer Reading) In Battery By Battery
1.265 . . . . . . . . . . . . . . . . . . . . .100% . . . . . . . . . . . . . . . . . . . . . . . .0%
1.225 . . . . . . . . . . . . . . . . . . . . .75% . . . . . . . . . . . . . . . . . . . . . . . .25%
1.190 . . . . . . . . . . . . . . . . . . . . .50% . . . . . . . . . . . . . . . . . . . . . . . .50%
1.155 . . . . . . . . . . . . . . . . . . . . .25% . . . . . . . . . . . . . . . . . . . . . . . .75%
1.120 . . . . . . . . . . . . . . . . . . . . . .0% . . . . . . . . . . . . . . . . . . . . . . . .100%
Refer to the chart below for approximate charging times.
PERCENT OF CHARGE 75% 50% 25% 0%
2 AMPS/12 VOLTS 6.5 HRS 12 HRS 18 HRS 23 HRS
15 AMPS/12 VOLTS 1.5 HRS 2 HRS 3.0 HRS 3.5 HRS
15 AMPS/6 VOLTS 1.8 HRS 3.0 HRS 4.5 HRS 6HRS
The times shown in the chart above are approximate and refer to an average automotive battery. For smaller
batteries, the charge time should be adjusted using the formula shown below and adding 1 hour to the time
calculated.
To estimate charging time for a discharged battery, divide the AH rating of the battery by the charge rate
selected. This is the number of hours required to recharge the battery. For example, a 50 AH (12 volt)
battery is discharged to 10 volts. How long should it be charged at the 15 Amp rate? Divide the 50 AH by
15 AH. The answer is approximately 3.5 hours. A six-volt battery is considered discharged when it reaches
5.0 VDC. Always round up the charge time by 25% to ensure full charge. In most cases, battery recharge
times will vary depending on the age and condition of the battery. Smaller batteries should be charged at
the lower rate (2 Amps) and add an extra hour to charge time.
APPENDIX B - SPECIFICATIONS
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.75” (14.6 cm)
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.25” (26.1 cm)
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.25” (15.9 cm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17.7 lbs, 8.0 kgs.
Internal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .self-resetting breaker
Reverse Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .indicator LED
Charging complete (12 V FULL) . . . . . . . . . . . . . . . . . . . . . . . . .auto shut-off LED for 12 volt
Convenience features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Handle
Power Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120V AC, 60 Hz, 2.8 Amperes
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