Cranking battery State of Charge test feedback

D34 in 200sx with a parasitic drain, left 14 days, 12.01 volts.
and started fine.

Quote:

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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.

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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

Tim, here's something for you that may surprise!

My P38 sat for 24 days without being started. It has an SC80 (with a switch on the earth wire which was left on for this 24 day period).

Both batteries are Supercharge All-Rounders at 105ah and 760cca.

24 days without starting or even opening a door:
Main - 12.23v
Aux - 12.27v

The SC80 was still in active mode. The engine cranked first spin.

Cheers
Keithy