12/11/2023 0 Comments Optima marine battery![]() ![]() Although it is heavier, the RC weight ratio of D34M is better when compared with 34M (2.76 min/lbs vs. ![]() However, when drained at a lower rate, D34M performs better - it has a higher reserve capacity (RC - 120 min vs. Optima 34M can provide larger starting currents, regardless of the temperature. Optima D34M and 34M have the same physical dimensions, but 34M is ~5 pounds (~2.3 kg) lighter. Optima 34M - 'D' is missing since it is starting battery for marine, recreational vehicles, and other similar applications.įor short - pay attention to that 'D' letter when buying Optima deep cycle, dual purpose and/or starting batteries! Photo on the right - Optima 34M battery - note the dark grey casing, typical color for Optima's starting batteries.Optima D34M - 'D' stands for 'deep cycle', '34' is for group size, and 'M' for marine operations (including recreational and other vehicles).Modern smart battery controllers can prolong battery life by desulfating deeply discharged batteries first and equalizing cells before the floating (maintenance) charging phase but don't abuse your batteries, and they will serve you for a long time! Optima BlueTop Dual Purpose Batteries Starting Currentĭual-purpose batteries can't provide as large starting currents as purposely built starting batteries.įor example, if we compare the Optima 34M BlueTop battery (dark gray casing, blue top - starting marine battery) with the Optima D34M BlueTop battery (light gray casing, blue top - true dual-purpose battery), we get: ModelĪs one can see, there is only one letter difference in the name of the batteries, but they are so much different in many details: Note: when discharging your lead-acid batteries (all AGM, Gel Cell, wet cells - not just Optima batteries!), don't discharge them below 20-25%. Optima BlueTop dual-purpose batteries are known for their vibration resistance, they are spill-proof and can be mounted in any position except upside down, can be fully discharged/recharged many times, etc. Note: Amazon affiliate links ("Model" column) open in the new windows, feel free to check them for the most up-to-date offers and prices. Technical data of Optima D34M, D27M, and D31M BlueTop batteries is given in the following table: Model Intro To Optima BlueTop Dual Purpose Batteriesĭepending on their intended purpose, Optima batteries, in general, come in three versions (actually four), easily distinguished by their top color: RedTop (automotive - starting), YellowTop (automotive - dual purpose), and BlueTop (dark gray top color - starting/cranking batteries and light gray top color - dual purpose/deep cycle batteries).įor more about version differences, please check Optima RedTop, YellowTop, BlueTop Batteries - Comparison and Recommendation article. How To Charge Optima BlueTop Dual-Purpose Marine Batteries. ![]()
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