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The battery in my 2014 smart 451 is about to give up the ghost. My lights dim when the AC kicks on and starting the engine is taking a bit too long. Of course it's about six years old so that is expected.

From what I've found I need an H5 34R battery. Do all batteries have the required vent connection? I found this one but Amazon says it's not the correct one and if I go to the Optima website it says they don't make a battery for smart. I found a forum post where a guy said he installed a red top Optima. I also found something where it said not all batteries even if the size was correct would work with the mounting system in the smart. I don't want to do zip tie mounting. Any recommendations for a quality battery sold in the USA would be great.

 

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