Thread: Cranking battery State of Charge test feedback

Originally Posted by drivesafe

Hi Ron and it always looks a bit strange when you measure a battery that has been sitting for a while and when you put a small load on it, the battery voltage slowly rises slightly.

This is actually quite normal and as you opened your doors, the interior light would be a small enough load to start the chemical reaction in the battery, and this is why there is a slight rise in voltage.

A long time ago I was told if trying to start with a flat battery, sounding the horn may up the voltage enough to start the engine. Is this along the same lines as your above post?

I've done three batteries in three years,all failed internally and would drop to 9V overnight,CAT batteries are the only choice if you regularly drive on corrigations. Pat