I haven't decided on one yet, - taking my time checking them out.
It seems the most common ones that are only around 1 amp are really too small to be very useful. Some of the cheaper ones can also be unreliable and possibly shorten the life of your battery too.
So far it looks like some of the more pricey "marine" type designs are the best quality and have the best features. I'm not really surprised by that, and I think it could be worth it to spend a little more on something that will last and be able to be used for other jobs in the future if needed.
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