A little bit of a mystery. The DLE is a fairly new engine and the rest of the equipment sounds early 2000’s. I’ve never seen a gas engine bound up from sitting but hopefully this will be the first. Typically the cylinder(s) are seized due to lack of oil in the fuel mix or run too hot. Good news if that is the case you can send it to Valley View for repair. Batteries are a little bit of a can of worms as you can now see. Personally I haven’t used a Nicad or NiMH battery in over 20 years, nor have I had a battery failure since then either. I just ordered a pair of 2200mah Lipo batteries for the large Edge ( 106cc ) pictured previously, $27.00 delivered. Although I agree that the older battery tech would be a direct drop in and there would be no need to worry about the higher voltage.