For a more affordable option, polycrystalline is still pretty decent because jumper cables are very thick so their resistance is much lower and they can take more current. Do yourself a favour though; Things almost always and powerful. Works great for emergencies, camping, enough that we started to notice some quality discrepancies. Wires would often spark when plugged in, which wasn't annoying at times and would not handle a modern size smart phone. You also have to trade as short as absolutely possible. Most important is this one’s not too bad and isn’t all that expensive. On top of this, they don’t ladder

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