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I'm not familiar with them.

It can and does supply close to its rated current, when the battery will accept it. This specimen supplied a steady 9.7A for a couple of hours at 13.5-14.6V while charging a LiFePO4 battery. A lightly discharged lead acid battery just won't accept that kind of charge current after sitting a few...

Noco does not disclose any useful details of their charging algorithms. This puffery is why I don't own a Noco charger. Yet I have in hand a Genius 10 and I can't deny its pleasing heft. Let us prepare to grapple with the ineffable itself, and see if we may not eff it after all. This is a...

The Battery Tender 5A is a 3-stage constant-voltage charger. The Costco in Reno was selling them for $46.99 over the holidays. I had already borrowed a 12-bit oscilloscope when I was in town and I thought this might be fun. The rest of this post is scope traces and observations. Kindly move...

Nice scope! I came home after Thanksgiving with a 12-bit loaner to play with for the next month. Those narrow pulses in #302 are only one sample wide. That scope can store at least 10M pts per channel. The waveforms can look even hairier.

What is this?

Ah, the power of wishful thinking. If only it could start your car when the battery can't. The effect of temperature on a lead acid battery's resting voltage is pretty small and the JT's overnight draw is (or should be) a fraction of 1% of battery capacity. Either the battery is deeply...

They don't take much to sit idle either. Our Honda draws more, and it has about one-third of the battery capacity. I really don't understand why so many people end up with chronically (and terminally) undercharged batteries.

Another cold start trace showing shunt voltage (yellow) and discharge (red). This taken on an RC filter with 33ms time constant across the MAIN- to chassis ground wire. It shows that the discharge from starting is returned to the batteries in about 25s, when the red trace crosses zero...

12.2V is low. EOL low. A few hundred hours of float charge at 13.5-13.8V might improve things but The popular smart chargers don't even have a proper float voltage. Some of them have a maintenance voltage around 13.2V, which would do some good but will never achieve a full charge.

Average of 13mA for 24 hours, measured with a Texas Instruments INA219. Base model 2023 JT with the key in the console. I measured in several other ways here.

No takers? Seems like the sort of thing a person should know. 83mAh, 0.1% of capacity, passed through the main ground wire from the moment I opened the door to get in to the time the alternator began recharging the battery. It's clear on the trace when I opened the door and got in, just after...

That's too bad, I'm sorry to hear it. I did take a measurement. My first thought was, did I mess up the units?

A 2023 3.6L with 7000 miles, clean injectors and plugs, well maintained batteries in a climate similar to that of Fish Lake Valley NV in early November.

Anyone care to guess how much charge a cold start takes? Amp-hours or percentage of battery capacity, your choice.

I'm not sure a DC clamp meter can measure what I want to know. So I did my own cold start current test. I used the wire from the main negative to ground as a shunt resistor. This carries all current from the batteries, not just to the starter. Change mV to A and multiply by 2.5 to read the...

I very much want to see this.

It is possible to recover some capacity in a mostly dead battery. I'm not disputing that. I'm saying that there's no secret sauce. Nothing in the scientific literature supports the claims that some patented algorithm accomplishes something constant voltage charging could not. Desulfating is a...

@Andy29847 You've figured out that the I in IBS is BS. I have something else to tell you. Smart chargers, aren't. The $80 toy with the slick marketing won't optimize your battery for peak performance and maximal longevity. It can't really detect and reverse damage to your battery. Patented...

Thank you.