Originally Posted by huggy39
Most major battery manufacturers make more than one type of battery for our use, basic(budget)-premium-super premium.
Some years ago I went to a auto electrical specialist shop to purchase a new battery for a car.
The man behind the counter showed me 3 batteries that were suitable in terms of Amp hours and overall dimensions. They had three very different prices and, thinking I was about to be conned, asked what the difference was.
He just invited me to pick them up and feel the weight difference. The best and most expensive was the heaviest one.
Nowadays I use 1000's of AGM VRLA batteries in my business and I find the same thing. You can get two apparently same batteries but the weight difference is just one way to determine performance and life expectancy.
See this 6 volt 4 Ah battery from a dubious unknown maker?, it weighs 580 grams:
Yet this genuine Yuasa, with the same specs, weighs 31% more at 763 grams: