Knowing the size battery is vital in terms of performance, to know what size is good for your boat, bear in mind several crucial aspects. First, there are the power requirements of the battery, which are lights, pumps and navigational devices, which all come under electrical systems of the boat. Then, there is the need to also look at the way you utilize the boat and the period of time because this would influence the total ampere hours required. Furthermore, there is a battery type such as lead-acid, AGM, or lithium which can affect the size considerations as well as the weight factors. When all these factors have been examined well, it is possible to look for the battery that will not only meet your power requirements but will equally add to the fun of your boating experience.