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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.
S
PECIFIC
G
RAVITY
P
ERCENT
OF
C
HARGE
P
ERCENT
OF
C
HARGE
N
EEDED
(H
YDROMETER
R
EADING
)I
N
B
ATTERY
B
Y
B
ATTERY
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
10 AMPS/12 VOLTS 1.8 HRS 3.0 HRS 4.5 HRS 6 HRS
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
(10 volts). How long should it be charged at the 10 Amp rate. Divide the 50 AH by 10 AH. The answer is
approximately 5 hours. 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 ...................................................................................................5.5" (14.0 cm)
Width ...................................................................................................9.5" (24.1 cm)
Depth....................................................................................................6.5" (16.5 cm)
Weigh...................................................................................................7 lbs (3.175 kg)
Internal protection ..................................................................................self-resetting breaker
Input voltage..........................................................................................120 VAC 60 Hz, 2.2 amperes.
Reverse Polarity .....................................................................................indicator LED
Charging complete ................................................................................auto shut-off LED
Convenience features .............................................................................Handle