Agree with all those comments but speak as I find! The manufacturer does state these are suitable for both starting and leisure use. Boats are typically used intermittently with days or weeks between use. Jaws takes to the road most days.I would not go for using a leisure battery for every day starting. They are designed more for providing steady power for long periods rather than big chunks very quickly. Boats get away with using LBs for starting because they don't start that often, compared top a car. Using an LB for starting every day will almost certainly reduce it's working life. Starter batteries are designed to give big currents for short periods and recover quickly from that, and if disharged like an LB will not last that long.
The first need is for a decent starting battery, there are plenty around so that will not be that difficult.
If you need the power when the engine is not running then fit an LB as well but choose a proper one.
There are some decent warranties around these days in terms of time but remember you will have to use the battery are it was intended to claim and be able to prove that. In reality I would not rely on a battery warranty that much even though my choice of LBs for our boat was helped along by the manufacturers warranty.
LBs are a compromise between real deep dishcharge batteries and starting batteries but in reality their starting capacity is limited as they cannot deliver the CCA outputs that an equivalent size starting battery can.
Used throughout last winter with first turn starting even at 12C below overnight, a quick trip to walk the dogs and start again to go to work.
As far as I can see the warranty stands.
