I am in the process of switching over to 2) 6V batteries vs 1 12V battery in my 5er. Picked up some interstate 6V batteries today but my new battery box wont be in for a few days. My question is "...
I have the exact same issue, its not that the straps dont help lifting them it's the bending over the lip to get them in.
Since my double white plastic battery box's have side mount rails (home made) I can undo them and tip the box's almost at a 45 degree angle so I can slide the batteries in or out using the straps. No need to dead lift them over the rail.