Temperature changes how the battery discharges and the amount of current that can be delivered.
A battery out of amps and volts can cause problems. This video is sponsored by Auto Value and Bumper to Bumper.
Just last summer, I had three batteries pass a conductance test, but fail to crank the engine on a sustained basis. The conductance tester indicated that these batteries were “good,” but they tested well below 100% capacity. In two cases, I was pursuing parasitic battery drain problems with used batteries. In another case, I had a new battery that would pass a conductance test, but not accept a recharge, said Gary Goms, Import Specialist Contributor.
One test is not enough if you are diagnosing a charging system problem. All too often, if only battery voltage is present with the engine running the alternator is condemned as the source of the problem. If this is the case, it means that the alternator is not charging, but does not reveal why.
Two of the greatest changes we’ve seen in starting/charging systems during the past few model years have been the expanded use of the Absorbed Glass Mat (AGM) battery as standard equipment and the accelerating pricing structures of both AGM and conventional flooded-cell batteries.