VSR OR BtoB charger

Hi. I am new here so please keep calm:). I will install another battery for my bow thurster,of course on a boat. The 2nd battery will be approximately 25feet from the start battery. To limit the use of thick wires,and to have a proper charge to the bow battery,shall I use a VSR or a BtoB charger? The batteries are 110ah lead acid sealed batteries.

Thanks