My Nextbase cam uses the 3M style mount, not the suction cup type, and it's been excellent. The mount is fixed nicely to the windshield, and the camera attached with a strong magnet.

It's wired in, so can't comment on battery life. It came with a little plastic tool for helping to push the wire into the edge of the interior trim, so I've got the wires tucked out of sight and I plug it into the car's 12V socket.