Leisure battery's aren't designed to be constantly topped up keeping hem 100%.
They will last longer if you let them discharge, then charge them back up. A battery may only have 200 charge cycles in its life time. If your constantly topping it up with a split relay you will use them up much quicker.
Just my thoughts on it.
I charge my 110 amp every 3 days. It works great.
Ctek chargers are so easy to use too. I just plug in to a socket permanently fitted to the battery. Simples.