Cad: Deka ETX-14 your best choice. finest AGM battery and priced right. 220 CCA's and incredible quality. one simple look at the terminals confirms that quality. manufactured here in northeast Pennsylvania. Deka also uses the following house-brand names on some of their motorcycle batteries: D-Series, Dominator, ETX Sports Power, Fahrenheit, Deka Gold, Intimidator, MaxPower, Outdoorsman, Precision Built, Pro Master, Solar, Ultimate, UltraBattery, and Unigy.
the ETX-14 available here in America for around $80 on multiple websites.
try Ebay.UK or Amazon.UK
do NOT purchase the L model as the terminals are reversed.
they are shipped sealed and fully charged. give it a top-off charge prior to starting the bike. 6 amps for 5 minutes does the job.
and avoid all temptation to purchase low-priced chinese batteries. they are garbage with false CCA ratings.