Thats why i asked for comparison info. Flying blind and learning. most of these batteries cost me £15 so thought it might be worth considering. The largest battery is CCA 360 amps on 12.8v. they are all in shells that can be broken open and disposed off. General public seem to struggle with the concept a smaller battery can still start the bike. I'll email the manufacturer for more info. The smallest is 418 grams, the biggest 360amps 1428 grams. The previous figure was a generic shipping weight so way off what it actually is. I'll break one open tonight to see if the specs are on the batteries.