For the most part I like this battery to use with my JP40Pro. It easily powers the cooler all day long. The few things that fall short are:
There is no indicator that the battery is charging. A few times I thought the battery was charging, only to find out, it was not when I came back.
The DC Output is very touchy. Many times I think I'm plugged in, but the cooler isn't powering on, so I have to go back to the outlet and push in the connector again, until I see the cooler come on. I would be nice to have an indicator on the battery, that a connection is made.
The magnetic part of the battery is a use at your own risk. If your cooler is stationary, then the magnet will hold the battery to the side of the cooler. If you have a rolling cooler like I do, the battery is going to fall off the cooler and honestly, when I'm rolling the cooler, is when I need the magnet the most. There really isn't much point of the battery being magnetic, if you have to carry the battery yourself, when rolling the cooler.