Review on Sunway Solar Connectors Maintainer Controllers by Samuel Nguyen

I purchased this kit to use as an extension cord and connect 12v devices to the battery with a clamp and 5.2 connector to power 12v cells . However, this reverses polarity in all combinations I've tried. Even with something as simple as using cigarette plugs as extension cords, the polarity is reversed. If your device is sensitive to this (many are), it can damage your device if it doesn't have reverse polarity protection (many don't). Looking at other reviews I see others mention reverse polarity. Not sure if that's all or just poor quality control and it's just random what you get. Be careful and check before use. To return.