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What is the best battery maintainer/voltage regulator for tuning?

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Dear HPA community, I did a lot of searching and couldn't find this topic listed in the forums so I do apologize if it is out there and I missed it. The topic has been on my mind for a long time and I need some help finding the best battery/voltage regulator for tuning. I know Andre touched on this a couple of times in the course material but there are a ton of items out there with no reputable sources. All I see are chinese units that look very sketchy and there are a lot of them. In case it I am not clear, I want to make sure to address that the voltage regulator is for connecting to the car's battery to keep the ECU's voltage constant while tuning. I have found one or two good ones but wanted to know what you all think about this. Any suggestions?

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