Why are Lead-Acid batteries allowed to have scam Ah/Wh ratings?

Car batteries are even worse in their labels... I remember buying some 12kg battery for the car with a 65Ah rating, implying around 780 watt hours which in turn implies 780wh/12kg = 65wh/kg energy density which is double the best that lead acid has to show... yeah right...

corporations all lie .

That happens with motor ratings, too.

12 amp vacuum cleaners. Who would want a vacuum that uses more electricity than a small house in 1950?

Those ratings are bogus.

The Chinese

I don’t know. I don’t understand the whole battery thing.

I used to make battery components for diesel subs back in the day. All I know is they are big and heavy, and don’t hook them up backwards!

Actually that’s a different story… there I was in command of a large USAF data processing center in USAFE. The civil engineers came over to test the generators, which they did every month. The FNG Airman switched to generator power while the computer was still on base power. The NCO shouted “NO!” But it was too late. The Airman in a panic switched everything back. All of the batteries boiled. That cost the taxpayers $100,000 plus an environmental impact report to the German authorities.

Most car batteries don't even list the amp hours. Just cold cranking amps. I guess since you are never supposed to discharge them much, and the main function is to crank the engine, that is all they were required to list.

Regarding deep cycle batteries. the more slowly the battery is discharged, the greater the amp hours it will appear to have.
You have to remember that the battery is a chemical reaction with some ion transport happenening in the electrolyte, so if the manufacturer tests the battery by drawing the power very slowly, they can show more amp hours than you will get in typical actual usage.

Yea I know military and governments are all full of retarded idiots these days

In europe it usually as both ratings for car batteries... like this:

[link to www.amazon.de (secure)]

That was just a random search in amazon, but the scam is strong there too... Varta 60Ah x 12v = 720wh with just 13.9kg, implying energy density of ~52wh/kg, lol...

I know about the slow vs fast discharge, my loads are very low in amperage, typically I have less than 3A draw in a 24v system... usually the inverter which takes around 0.5 amps, a 8w LED lamp, a low power pc (~30w with the monitor on) and a router (6w). Still the batteries suck big time even in very low draw. And the spec sheets also have different capacity ratings on different draw levels which are totally bogus... like if you draw 10w, you have 90Ah... if you draw 100w, you have 80Ah, if you draw 200w you have 70something, etc... but these are totally bogus, meaning all ratings are less than half than the claimed capacities.

What are you talking about homo? A 105ah battery at 12 volts is about 55 pounds. Thats about right. A 225ah 6 volt battery is about 62 pounds. Smoke meth much?

Why mess around with lead acid anyway?

AGM is far better. Absorbed Glass Mat, check it out, worth every penny.

Open wet, AGM and Gel are all lead-sulfuric acid types, with similar scam capacities.

55 pounds for the 105Ah = 25kg / 105Ah = 25kg for (105 x 12) 1260 watt hours

1260 watt hours / 25kg = 50.4watt hours per kg. This far exceed the ~35wh/kg rating for good batteries.

And when I say "This far exceed the ~35wh/kg rating for good batteries.", I mean the 105Ah rating is an obvious scam. For its weight that battery should have 60-70% of the stated max rating. Instead of 105Ah it should be rated closer to 65-75Ah, max.

this

IMAGE ( [link to i.imgur.com (secure)] )


The grey bubble is where lead-acid (wet/open, gel or agm-sealed) are typically playing... in the 20-30wh/kg density area, maybe slightly higher for the good ones.

By the weight alone you can tell a battery is a scam because it can't have, say, 50wh/kg. That's beyond the lead-acid energy density.

Lying in advertising is completely legal in the USA

Different rating standard.

Same reason Pyramid audio is still in business selling 1000watt amps: 1000watt peak, for half a millisecond, at 20volts, 20% THD.

Because we don't make or deal with lead in this country. Try going after a Chinese company. They don't care