The first battery known, circa 250 BCE. Unearthed from a Bhagdad archeological dig amongst Sumerian artifacts. When filled with vinegar, it produces 1.1 volts. Use uncertain.
Check EBAY for a 919 battery and you will see two price strata: $95 to $110 for a Yuasa, and in the $40 to $55 range for no name batteries. The only real difference between the two is the cheaper ones are poor copies of the Yuasa, with shortcuts taken in the plate thickness, intracell and intercell jumpers, plate chemical matrix construction, vent valve configuration, etcetera, all with an eye toward cutting costs and getting a battery that initially cranks faster than an equivalent new Yuasa.
There is, however, a price to be paid, and that price is longevity. In order to make a "hotter" battery, the plates are made thinner in order to pack more into the available space. Every battery's positive plates erode, and the thinner plates in the economy batteries usually fall apart in a year or two, obviously ending its life, usually right after the expiration of the warranty. It just won't crank the motor over one morning.
Yuasa knows their stuff. My '02 needed a battery right after I bought it used due to sitting in New Mexico for over a year, and its replacement is approaching 5 years old without showing any signs of weakening. Definitely worth the $92 it cost.