I'll waste my breath, as I seem to do on every forum when the topic of batteries come up.....
From 1987-1993 I worked to Yuasa-Exide Battery in Sumter, SC as a production operator in several departments and then as an Engineering Technician the last two years I was there. We manufactured batteries with the brands of "Yuasa" and "Exide" but also *lesser quality* brands as Challenger. The thing is, all of these batteries came from the exact same batch of batteries. They went through every aspect of the manufacturing process, side-by-side, until the "Formation Room". In this department, the cells were filled with acid, charged, and then put through at least one discharge test that determined their quality.
The discharge test was a quick draw-down of the cells, and every few minutes, the operator would go through the circuit with a hand-held multimeter and check the voltage across each battery. Depending on the battery's voltage at a given time, it would be deemed as good enough quality for Brand A, Brand B, Brand C, Brand D, or as scrap.
Now, most circuits of batteries that were being charged consisted of 18-96 batteries. The operator started at one end and worked their way through each cell, calling out the voltages, as another operator wrote down the numbers. The draw-dawn tests were a short period of time, such as fifteen minutes, so if the operator started on one end of a 96-battery circuit, by the time he reached the 96th battery, it would naturally be much lower than the voltage of the first battery he read. Now, take into account illegible hand-writing and water smearing the ink on the paper (there are shower heads constantly spraying water on the batteries to keep them cool), and you have a lot of good batteries being started as bad, when in fact they may have been better quality than the better branded ones. After the ranking of these batteries from the draw-down tests, they were separated after being recharged and sent to shipping where they were cleaned, had labels slapped on them, and boxed for shipping.
So, I tend to buy the cheapest battery I can find and often buy off-brand batteries from places such as
www.ebatteriestogo.com . I've owned and seen a LOT of crap Yuasa, Exide, and Interstate batteries that couldn't hold a candle to most of the cheaper batteries I've owned. If not anything else, for the going price of an OEM Yuasa battery, I can easily buy 2-3 cheaper brands that will far outlast the life of that one Yuasa battery.
Ok, continue preaching how great OEM and Yuasa batteries are. I'll go back to surfing....