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12.2
The Hydrometer
or Electronic
Method
To find the time needed to fully'charge your battery, determine the' bat-
tery's charge level with a hydrometer or electronic Percent-of-Charge
Tester; The following table will help you convert hydrometer readings to
percent of charge values•
SPECIFIC GRAVITY
PERCENT OF CHARGE
PERCENT-_OF CHARGE
NEEDED
"'""'"'"'""'"""'"'"9*""
"'"."
'""
"
1.265
"
t00%
'
0%
....
1:225 "
"."
75%
' "
25%
"'
.............................................
I
• 1.155
25%
75%
1.120
.
0%
100%
When you know the percent of charge and the Amp Hour (AH) ratingof
.' • your battery, you can calculate the approximate time needed to bring your
battery to a full charge•
To convert
Reserve Capacity to Amp Hours, divide Reserve Capacity by
2, and add 16:
Amp Hours = ReServe
Capacity.
+ 16
2.
NOTE: The Reserve Capacity can be obtained from the battery specifica-
tion sheet or the owner's manual•
To calculate
time needed for a charge:
•.
• " '
_ Find the percent of charge
needed, (A battery.at 50 percent charge that.
wilt be charged to t00 percent needs another 50 percent (.50)).
• Multiplythe
Amp Hour rating by the charge needed (.50) and dMde by
•the charger setting (2 Or 10 amps).
- Multiply the result by i .25 and you'll have the approximate t!me needed,
-in hours, to bring the battery to full charge.
- Add one ad_itionat hour for a deep:-cycie battery.
Example:
Amp Hour Rating x Charge needed
x
1,25
=
.. hours of
Charger
Sett!ng
char:ge
t00 (AH Rating) x ,50 (charge needed) x
50 (Charger Setting)
1.25
=
6.25
hours
100 x .50 = 1:25 x 1.25 = 1.5625
5O
You will need to charge your 100-Ampere Hour Battery for approximately
1 112hours at the 50-Amp charge rate using the above example.
-
'
.13.
"