I’m glad you are:
a recognized expert in lead acid and other batteries, a paid consultant to electric car companies, and have 22 years experience in designing and testing chargers and batteries.
That’s commendable. I’m glad you are here. Welcome!
However, I don’t think you read carefully what I wrote and what I was attempting to convey. I believe that perhaps we are really talking about 2 different things and you don’t realize it.
I’m not a battery expert, but I assure you with 100 percent certainty, that I work with more
motorcycle and Powersports batteries, of every type, make, size, fitment, and condition, than anybody here, yourself included, notwithstanding my fellow professional mechanics here. Not a boast but rather a statement of fact.
I own and operate in excess of 40 battery chargers in my workshop which are connected to about 25 or more motorcycles, quads, ATVs, UTVs and trikes, every single day.
There is engineering and there is real world conditions and
I tell you with 100% certainty that I have never been able to successfully use a 750mA charger to resurrect an otherwise competent battery that has been totally or nearly totally discharged.
It has been my oft repeated experience as a seasoned end-user, that the logic circuits in the automatic chargers of that size, and those smaller than 4 Amps, make the charger incapable of determining the actual state of the battery, and then accurately begin and execute a charging cycle capable of bringing a motorcycle battery back to life.
I don’t base this upon calculations on a sheet of paper. I base this upon literally hundreds upon hundreds of real-world, sitting right in front of my face, experiences.
Everybody is entitled to their own opinion, but not there own facts.
I suggest that until you try it, in real world conditions, like I do, every single day, you don’t have any independent empirical data to support your belief.
I agree in principle that if you can throw 750mA into a healthy battery, without any logic circuits being involved, so just a complete 750mA continuous uninterrupted output being sent into the receiving battery, then yes, that energy will be transferred into a otherwise healthy battery.
However, this is not how I have found these smart charger devices work. You should know why this is, as an expert and I would love to understand why it is like this.
I know you think you know better, and maybe you do, but consider perhaps, I humbly suggest you try this test.
Take 2 simple Yuasa brand, new lead acid batteries. Add the electrolyte. Hook the batteries up, 1 to a 750mA unit or your 800mA unit and 1 to a 4A or greater unit, and leave them overnight.
I guarantee you, you will return to the 750mA charger battery, no further down the road of charging than when you started. In fact, you will find it flashing codes at you that the battery is fully charged even though it is dead as a door nail, while the 4A (or larger) charger battery will be fully charged and ready to install and use.
I do not claim to know why. I just know that I have personally observed this phenomenon time and time again.
Another test is to take 2 AGM batteries. Discharge them nearly completely by leaving the headlights shining on a motorcycle. Then hook up the two different chargers to the 2 batteries and again, leave them on overnight.
Once again, I will 100 percent bet that the battery on the tiny charger, will be flashing it’s little heart out that the battery is fully charged, but it will not be any further than when you started, while the larger amperage charger charged battery will be ready to roll again.
I’ve done this also with Lithium batters too although only 2 or 3 times. Same results.
I’ve performed these exact tests at least a dozen times with various makes of chargers. My results are always the same.
I have serious coin invested in the number of battery chargers I own and operate in my shop. I wanted to know if what I was seeing was reproducible, and I found it to be so.
I respect your learned opinion and I’m very excited to read more of your posts in the future, but I stand absolutely solid in my resolve upon what I wrote. It’s my business and I do it every single day and my extensive real-world experience in this arena tells me so.
As I initially said, I really think we are talking apples and oranges as far as how the chargers are being used and what they can do with a dead or nearly dead battery, as opposed to just maintaining a charge on a BMW GS in a garage.
To each their own.
YMMV.
. Peter