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Not disagreeing with that. Wondering if some of the devices change their charging profile in response to observed high resistance. There could be a similar problem when charging a battery still electrically attached to the rest of the car. Most vehicles these days pull 25 mA or so out of the...

I am curious how this is actually wired together. That is, which type of electrical connectors are used where. I can see an alligator clip in the picture but it is all a bit of rat's nest and the cables from the multimeters exit the picture. Also these use bluetooth. Do you have a spare...

Mine would do constant current charging only briefly and then would go into a pulse mode. The technical description of how this device works is mostly lacking, and there is no mode indicator, but it could be that it was improperly entering the desulfating mode, which pulses. The thing is, it...

There is no "mode" indicator on this model. Yet it definitely has modes. When it first starts it begins with 12.x volts and works its way upward to 14.x (x because I don't recall the digits). This is some sort of probe mode, determining the state of the battery. I have seen it do this step...

My Harbor Freight 63350 seems to have failed, but not in a "dead as a door nail" manner. Near the end of charging, which was after many many hours, it used to charge an AGM battery with the screen showing a voltage dancing around 13.2-13.4V (the current is rapidly cycling at this point), until...

The HF 4A battery charger has two issues that I am aware of: 1. It is almost impossible to get it to charge a battery at 4A. This is based on observations with a clamp DC ammeter. Normally it will start out at 2A and then pretty rapidly go down from there. The only time I have ever seen it...

Very interesting thread. Thank you for all of the work. A couple of points though. It would be nice if the integrated Ah for the charging cycle was provided. Ideally at each time point as a third graph, but at least as a numeric value for the whole test. If the data starts out in some sort...