I responded to this on the HU website, too.
Any LTH locale or retailer should have a comparable battery.
Yuasa quality is NOT what it used to be!
There is a Triumph dealer in Leon
EUROMOTO | León | (477) 29 30 888
Stop any pizza/pharmacy rider and they will tell you where the nearest moto shop is, same for a taxi driver.
Take your old battery with you and say, "Quiero una nueva, por favor".