![]() Volts – typically dual purpose batteries are all 12VĬCA or MCA– the cold cranking amps (cca) or marine cranking amps (mca) measurement tells you how many amps will be delivered to the engine in cold temperatures. A bigger boat on longer trips would probably not be best for a dual purpose battery.Īs with all replacement batteries, there are a few key things to look for when selecting a dual purpose replacement battery. If you only take short boat trips on a smaller vessel, the dual purpose may be all you need. Typically, deep cycle batteries are built to withstand a lot of discharges and recharges but dual purpose batteries don’t do well beyond 50% of usable capacity and also don’t stand up as well in tough conditions, many can be especially prone to overheating especially when used for long periods of time. So too when comparing dual purpose with a starting battery, in fact there are plenty of occasions where a dual purpose battery won’t actually be able to start a vehicle. Much like the jack-of-all-trades vs master-of-none, the dual purpose battery does ok in its deep cycle role but certainly its runtime will generally be nowhere near as good as a deep cycle battery. While there may be some truth in those points overall, it’s not entirely accurate. ![]() One of the biggest misconceptions that we hear is that it’s better to buy a dual purpose battery instead of a deep cycle or starting battery because it does the job of both, it takes up less space and it’s more cost-effective to buy one battery vs two. ![]() We briefly looked at Dual Purpose batteries in our RV & Marine replacement battery post recently and feel it’s important to get a little more detailed about these types of batteries. ![]()
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