The only thing I'm concerned about is flooding...
I stopped using autos when I got sick of the Blinks of Death... But that was well over a year ago, I'm sure they are designed better now... A lot of the better 510 autos out now have a new design that prevents liquid from getting into the battery, while still allowing airflow. I'm hoping that these are pretty leak proof, but I understand that they have to add the 'beware of leaks' disclaimer since it is an auto batt...
Whaddaya say Bad, how leak proof are these .......s? About average, better than average?