Battery Desulfator

Scope-o-gram Annotations

The following images from the above web site were 1) reduced in size and 2) annotated to facilitate comprehension (IOW, I did this to facilitate and insure my own grasp of the theory and design of this desulfator; there is no better way to learn something than to learn it with the intention of teaching others).

Picture #1    (Bad battery)

The waveform at the (test point) X105 terminal when at the beginning of the desulfation process.

The horizontal scale is 2 msec/cm and the vertical scale is 5 volts/cm. Note that the battery voltage between pulses is about 12 volts and the pulses are about 35 volts by the time they get to the battery.

Calculated current is about 30 peak amps in each pulse.

Picture #2     (Bad battery)

This is the "ringing" part of the waveform expanded out so that you can see the exponential decay of a fairly constant frequency. (The upper trace is an unavoidable ghost trace that is necessary to see the ringing clearly. It means nothing; disregard it.)

Picture #3    (Bad battery)

The desulfation pulse expanded out to 1 microsecond/cm.

Note how the voltage peaks to 35 volts and then slowly lowers to about 25 volts. This sloping pulse is indicative of relatively high internal battery impedance.

Note the "ringing" at the end of the pulse. This is the "battery resonance" noted in most of the desulfation articles in the reference.

Picture #4    (Good battery)

The waveform at X105 for a "good" battery that has gone through a complete desulfation process. Note how the pulses are limited by a good low impedance battery to 20 volts versus the 35 volts of a fairly well sulfated battery in photo 965 [and 970].

Picture #5    (Good battery)

The desulfation pulse expanded out to 1 microsecond/cm.

This is a "good" battery. Note how flat the top of the current pulse is. This is indicative of a good battery with low internal resistance. Battery ringing is still quite evident for this battery.

Picture #6    (Trashed battery)

A completely trashed battery. The vertical scale is now 10 volts/cm. Note how the desulfation pulse goes all the way up to 50 volts and then rapidly decays to near zero. The odds of recovering this battery hover somewhere around the odds of winning a shouting match with an FAA inspector.

Picture #7    (Trashed battery)

This is picture #6 expanded out to view the voltage 'decay'.

The same pulse expanded out to show that there is practically no current being driven into this trash battery. No ringing, no real chance at saving the battery unless after a few weeks of treatment something inside starts breaking down and begins allowing the desulfation pulses to drive current into the cells.


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