On my sail I have 2 full battens at the top and some partials down lower. The batten pockets close via velcro. It seems when it gets extra windy I lose the lower (5.5 ft long) full batten. Last night I was out and a storm blew up. Since it was dark I didn't notice the missing batten but this morning when I went out it was clearly not there. A few weeks ago I had the same problem. Any suggestions on how to make sure I don't keep buying new battens other than closing the pocket, which was closed and held the batten on earlier sails. They aren't expensive but the price adds up.