I'm going a slightly different route with a battery cover on my RadRunner 1. I ordered calf supports/wraps for my battery as a test. Made for hikers they are insulated as well. I'm pretty sure I ordered the correct size after measuring everything. I have to be able get my hand under the battery to push it up in order to remove it, so I figure if I can completely remove the wrap it would be easier. I'll see how well my $20 experiment works when the calf wraps (2 per pack) arrive. I do like those purpose made ones though.