GM Service Manual Online
For 1990-2009 cars only

Battery Temperature vs. Voltage Drop

Estimated Temperature

Minimum Voltage

70 Â° F (21 Â° C)

9.6

50 Â° F (10 Â° C)

9.4

30 Â° F (0 Â° C)

9.1

15 Â° F (-10 Â° C)

8.8

0 Â° F (-18 Â° C)

8.5

0 Â° F (below -18 Â° C)

8.0