I'm not one to get prematurely excited...but can someone explain this

[IronHead]

That terminal is a shunt so that an analog amp meter can be use to determine current load. Along with a stop/alarm clock we can see what load this battery can take and for how long giving the results of stored charge.   

[Cap-Z-ro]

Thanks for the brushless info guys...I believe I have saved one of those also.

Would there be voltage spikes in a 9 volt circuit that could damage the transistors in the motor circuitry ?

Regards...

Latest readings on motor charger...7.69 vdc

[FatBird]

@ IronHead

Great Idea with that shunt.  I used to have a couple 300 Amp Shunts, but I lost them when I moved.  Besides 2 Large Bolts for the Main Current, they had 2 little screws for an Analog Meter.  I used mine for measuring large currents.  Can you give us an example of using the Stop Clock with the Shunt & do a typical calculation.  I never tried that.

@Cap-Z-Ro

It takes more than a 9 Volt Batt to blow the 12 V PC Brushless Motor Transistors.  My best guess is that it would take a Spike or Spikes of 25V or higher.

Thanks.



.

[IronHead]

Well if you have an 18 amp hour battery (18Ah also called Deep Cell charge rating )  then you should be able to discharge 18 amps for one hour. Not to be confused with Cold Cranking Amps. CCA is the batteries peak discharge ability. This current discharge rating also has a time factor  involved before damage occurs.
That is if the battery is rated properly. It is best to do this Amp Hour test on a full charged battery first to compare results of battery charging cycles. A smaller battery would be rated in milliamps such as 2800ma.
This would mean 2.8 amps for one hour at its rated voltage. Also  2.8 amps in one hours to charge this battery to peak. Or any combinations of time and current to achieve the overall 2.8Ah

Batteries can get pretty complicated when it comes to  charging. Surface charge, Deep charge, Ghost/Virtual  charge, charge curve, over charging and so forth. Time and current rate is what dictates what type of charge a battery will take and/or maintain.. Voltage means little,  the voltage in normal conditions only needs to be just above the battery peak rating. This is something we do not see in the case with this series cap motor cap configuration, SCMC. We see voltages far below what the battery rating is on these caps and the battery should not be taking a charge because of this fact. So we still do not know if the battery is taking a current charge , usable energy

We are going to walk through the physical behavior of electrical charge and discharge of this battery charging configuration and why these things seems to be happening based on what seems to be some kind of phenomenon. Yes I am saying the answers are already known , but we will run the cource to make sure we are not seeing some kind of anomalies effect here. Why , because when people hook thing up in ways that have not been studied in some type of incorrect circuit beyond specification for its components.  This is when we find strange effects or accidental discoveries.   

Hook it up backward, sideways and inside out . What does it do.
You will never truly know unless you Build It!
IronHead

[Cap-Z-ro]

Thanks FBird...that is good to know.

The motor I have was salvaged from an old desktop comp...it looks pretty rugged...at least in its housing...haven't opened it up yet.


Thanks IHead...very useful and informative battery info.

Latest motor charger rating @ 7.71 vdc.

Regards...