Battery box filling up with water.

I don't understand why those boxes don't come with weep holes.

Every so often this same post comes up, and the answer is everyone drills holes in them.

Jack L

Check the box on your tow vehicle if concerned about corrosive stuff.

I had a battery box with small vents on the top, where water could get in. But why they had vents at all was the great question - it wasn't a sealed box by any means, and plenty of room around where the cables when in, even around the edge of the lid. I just sealed the top vents up with caulk.

Battery box is supposed to keep the corrosive stuff in - I wouldn't drill drainholes.

I’ve had this problem in two battery boxes. I just flipper them over and drilled holes. Solved the problem.

I've had the same issue. I just let the water get in. Once year I take them out and clean connections, etc. and drain it then.
I'd rather not have holes in the bottom that might let corrosive liquid randomly come out and fly back against something on the TT.
During winter storage, I put a board over the tops of them so rain doesn't get in.

Yep, drill some drain holes.

Drill the holes. Just make sure you remove the battery first.

I drilled two holes in each my batt boxes... Otherwise when it rains they fill up pretty high with water...

I would drill holes in the bottom of the box