Quote:
Originally Posted by patrolman pete
An old way that the AA used to test batteries was to charge by running the engine for 5 mins , then disable the engine by pulling a fuse so that the car would crank but not start. Crank the engine for 15 seconds and listen to the cranking speed , and if it starts to drop , the battery is unserviceable . That is a live drop test and is pretty conclusive.
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The important thing to note with the old type simple test is volt drop over a specific time from a reasonably, ideally fully charged battery, the cranking speed can be an indicator, but can be affected by engine faults.