Yuasa is indeed a excellent make, have used these on m/bikes myself, I had 100% confidence until they supplied me one with a different battery number on the top to the front, if that wasn't odd enough the top + and - marking were the opposite way around to the case markings, could have been a expensive job if I'd connected it.
You shouldn't use a trickle charger for storage purposes, but I assume you mean a cyclic or conditioner charger, LIDL were doing a excellent one for £15 a few months back, use this myself on a caravan, even revives(most0 old dead batteries that std chargers won't touch.
tabetha