![]() ![]() Turns out they required a larger res cap - which it sounds like the newer/larger OB's need, as well. When Mercruiser first came out with DTS (Digital Throttle and Shift) on their stern drives, we were having issues with electrical faults. I have zero experience with that particular 27M6 so I won't comment on that. Personally, I'm still a fan of a true starting battery and a true DC battery - but that is based on experiences with the traditional DP battery. The MTP-65 battery is a traditional flooded battery where you’d have to add water to increase their lifetime. This battery fits cars requiring group size 65 batteries. Labelling this one 27M6 but calling it a DP is a little confusing! If you look through the chart that you linked, you'll see what I mean - heck, they even have it listed in the starting battery section. Touted to be the best, MTP-65 Battery meets or exceeds your expectations when compared with the OEM vehicle battery. I was only aware of the ones that were specifically labelled with "DP" and that the "M" always meant "starting battery". I can honestly say that I was not aware of this particular DP battery. It's kind of like "cleaner wax" - it can't be great at both things. from working in this industry for nearly 25 years, the DP are a fine choice, but they don't seem to last as long as using a dedicated starting battery or deep cycle. Within the MM line, there are starting, deep cycle and dual purpose batteries. It is simply the name given to their wet-cell batteries. ![]() ![]() The "Marine Master" is not a "dual purpose", per say. Enjoy low warehouse prices on name-brand Lion Energy products. However, for small, easy to turn engines like most outboards, it's not as big of a deal as if we were turning over a V8 inboard. Find a great collection of Lion Energy at Costco. A DC battery doesn't tolerate the high/quick amp load over time as well as a starting battery. Personally (and part of this comes to talking to a manager from "inside" the Deka manufacturing plant), I still like to use a starting battery for the engine. And without knowing the intended use, it's hard to recommend a battery type. saved me the typing! My only point with the sports car vs minivan is that they are used for different purposes. ![]()
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