If you've read some of my posts, you know I hate 9V batteries. I finally finished a working prototype of a 9V voltage booster so I can use a rechargeable LiPo in my Pro-Find 35. Here are a few pics:     Based on indoor testing, the performance exceeds the stock 9V battery. If you want to learn more, check out my blog post: https://gadgetsoftheoutdoors.blogspot.com/2019/05/discussion-getting-rid-of-9v-batteries.html I was hoping to use loose AAA cells for this, but