TM 5-3805-262-20
5-9. BATTERIES AND CABLES MAINTENANCE (CONT)
a. B a t t e r i e s ( c o n t ) .
(2) Testing (cont).
SPECIFIC GRAVITY CHECK (SHEET 1 OF 2)
( a )
(b)
(c)
(d)
(e)
( f )
(g)
Check battery electrolyte level (page
5-140). If water must be added to check
s p e c i f i c g r a v i t y , f a s t c h a r g e b a t t e ry
(page 5-146) for 30 minutes before
proceeding. Do not re-install battery
c e l l c a p s.
Draw electrolyte sample from one battery
cell using hydrometer.
Record hydrometer indication as shown
a n d r e t u r n e l e c t r o l y t e t o b a t t e r y c e l l .
Lower thermometer into battery cell,
record electrolyte temperature, and
remove thermometer.
Repeat steps (b) through (d) for remaining battery cells.
Correct the hydrometer indications
for temperature as shown. Add
0.004 for each 10 degrees above 80
degrees F.
Subtract 0.004 for each
10 degrees below 80 degrees F.
Compare corrected specific gravity
i n d i c a t i o n s w i t h f o l l o w i n g l i st
and determine battery level of
charge .
B a t t e ry
Freezing Point
Charge
S p e c i f ic
o f E l e c t r o l y te
(Percent)
G r a v i ty
(degrees F)
100
1.260
-75
75
1.230
-38
50
1.200
-17
25
1.170
+ 1
0
1.110
+19
5-144
