Nothing, as the battery ages it looses a lot and the pannel draws juice so the battery is even lower. At one point I had one of those batteries hooked up to the bottom of my starter, that worked grreat but it was heavy. I went over to running everything from one of those engine jump starters, I clip it to my power pannel to run my long glow driver and fuel pump too. With all the great batteries we have today you have a lot of ways to do it. One of the guys I fly with has one of those 18V drills and chucked up a nose spinner in it, starts up to a 50cc gasser. One day he lit up my G-62 for me to just to proove it would do it. Brushes, I just took mine in with me and matched them up. I bought that starter used and I used it for years and years. I do have a bigger and better one now but as needed I just kept fixing it!!