Flooded Lead Acid... who's ever still using those (or even making them for bikes). Valve Regulated Lead Acid Absorbent Glass Mat (VRLA AGM) ... the norm (with calcium enhanced lead or something) Lead Acid Gel ... or something like that. Has some sort of drawback, maybe. Lithium Iron Phosphate
... Need a special IC controlled intelligent charger, but some 16 cell units have north of 1000CCA... will that much power screw up something on a bike.
Which kind do you like ?
Lots of Chinese made AGM's out there under various bargain house labels, gotta watch out. Might be okay, or might be junk.
Eastern Penn Manufacturing makes a nice lineup of VLRA AGM batteries here in the USA under the brand name Deka.
Heard the king dog YUASA farmed out production to Mexico and/or China around about 2013 ... True?