Yamaha MM700A Manual page 152

146
Take reading
Do not suck
much
in too
electrolyte
must
Float
be free
Hold the hydrometer vertically and note the number in
line with the surface of the electrolyte (Figure 3). This is
the specific gravity for this cell. Return the electrolyte to
the cell from which it came.
The specific gravity of the electrolyte in each battery
cell is an excellent indication of that cell's condition (Ta-
ble 2). A fully charged cell reads 1.260- 1.280 while a cell
in good condition reads from 1.230-1.250 and anything
below 1.140 is discharged. Charging is also necessary if
eye level
at
Hold
tube
vertical
NEEDS
CHARGING CHARGED
Float
the specific gravity varies more than 0.050 from cell to
cell.
NOTE
If
a temperature-compensated hydrometer
is not used, add 0.004 to the specific gravity
reading for every 10" above 80s
For every below 80' F ( 2 5 O
0.004.
CHAPTER SIX
FULLY
Weight
subtract