Suzuki WagonR+ RB310 Service Manual page 2674

CHARGING SYSTEM 6H-5
HOW TO USE THE TEMPERATURE-CORRECTED
STATE-OF-CHARGE GRAPH
Suppose your specific gravity reading is 1.28 and the battery tem-
perature is –5_C (23_F). Locate the intersection of the –5_C line
and the 1.28 specific gravity line.
The intersection is within the "A" zone (shaded area in the graph)
and that means CHARGED STATE.
To know how much the battery is charged, draw a line parallel to the
zone demarcation line and extend it to the right till it meets with the
percentage scale. In the present example, the line meets at about
85% point on the percentage scale. Therefore, the battery is
charged up to the 85% level.