Textron PROWLER EV User Manual

MAINTENANCE
35
Using A Hydrometer
1. Draw electrolyte into the hydrometer several times to permit the thermome-
ter to adjust to the electrolyte temperature and note the reading. Examine the
color of the electrolyte. A brown or gray coloration indicates a problem with
the battery and is a sign that the battery is nearing the end of its life.
2. Draw the minimum quantity of electrolyte into the hydrometer to permit the
float to float freely without contacting the top or bottom of the cylinder.
3. Hold the hydrometer in a vertical position at eye level and note the reading
where the electrolyte meets the scale on the float.
4. Add or subtract four points (.004) to the reading for every 10° F (6° C) the
electrolyte temperature is above or below 80° F (27° C). Adjust the reading
to conform with the electrolyte temperature, e.g., if the reading indicates a
specific gravity of 1.250 and the electrolyte temperature is 90° F (32° C), add
four points (.004) to the 1.250 which gives a corrected reading of 1.254. Sim-
ilarly if the temperature was 70° F (21° C), subtract four points (.004) from
the 1.250 to give a corrected reading of 1.246.
5. Test each cell and note the readings (corrected to 80° F or 27° C). A varia-
tion of fifty points between any two cell readings (example 1.250 - 1.200)
indicates a problem with the low reading cell(s).
As a battery ages the specific gravity of the electrolyte will decrease at full charge.
This is not a reason to replace the battery providing all cells are within fifty points of
each other.
Since the hydrometer test is in response to a vehicle exhibiting a performance
problem, the vehicle should be recharged and the test repeated. If the results indi-
cate a weak cell, the battery or batteries should be removed and replaced with a
good battery of the same brand, type and approximate age.
Hydrometer Temperature Correction
°F °C
160 71
150 65
140 60
130 54
120 49
110 43
100 37
90 32
80 26
70 21
60 15
50 10
40 4
30 -1
20 -6
10 -12
+.032
+.028
+.024
+.020
+.016
+.012
+.008
+.004
0
-.004
-.008
-.012
-.016
-.020
-.024
-.028
+.030
+.026
+.022
+.018
+.014
+.010
+.006
+.002
-.002
-.006
-.010
-.014
-.018
-.022
-.026
EXAMPLE #1
ELECTROLYTE TEMPERATURE
Above 80 °F (27 °C)
AMBIENT TEMPERATURE
Above 80 °F (27 °C)
ELECTROLYTE TEMPERATURE
Above 90 °F (32 °C)
HYDROMETER READING 1.250
1.250 + .004 = 1.254
CORRECTED SPECIFIC GRAVITY
READING
EXAMPLE #2
ELECTROLYTE TEMPERATURE
Above 80 °F (27 °C)
AMBIENT TEMPERATURE
Above 80 °F (27 °C)
ELECTROLYTE TEMPERATURE
Above 70 °F (21 °C)
HYDROMETER READING 1.250
1.250 - .004 = 1.246
CORRECTED SPECIFIC GRAVITY
READING
ELECTROLYTE
TEMPERATURE

Textron PROWLER EV Specifications

General

Brand	Textron
Model	PROWLER EV
Category	Offroad Vehicle
Language	English