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Optima batteries with dark gray casings are true starting batteries and although they can be used in cycling operations too, they should be used as starting batteries, only. As starting batteries, they are not as strong as true starting batteries, but they tolerate deep cycle operations much better.
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battery casing: Optima batteries with light gray casings are dual-purpose batteries and can be used as both starting and deep cycle batteries. There are several ways to distinguish Optima batteries regarding their intended purpose: Optima RedTop, Optima YellowTop, and Optima BlueTop Batteries Comparison Choosing the right one can be a daunting task, but it shouldn't. Optima group 34 batteries come in several, often very similar versions, but optimized for certain applications. BCI Group 34 batteries are commonly used as starting, dual-purpose, and deep cycle batteries in cars and other vehicles, in boats, off-the-grid applications, etc. Optima batteries are a very popular automotive and marine battery brand. Optima RedTop 34, 34R, 34/78, Optima YellowTop D34, D34/78 and Optima BlueTop 34M, D34M Batteries Comparison