My X5 has an amp draw. F11 and F60 circuits are problems. I hope to have the problems solved soon. I didn't put the X5 on a charger overnight. The battery was at 12.1V. It was enough to crank it over. I use a bluetooth adapter to check voltage at the cigarette lighter. If it's under 12V, a battery pack is used to boost it. I normally charge it every other day if not driven daily. Today, I took out a new tool, an 18V A/C converter. My biggest 18V 9aH battery was used to charge the battery. After almost 2 hours, voltage was 12.4. It would have been higher if I didn't open the rear hatch a few times for tools or spare parts. Testing it previously, the 18V battery lasted a little over two hours. 2.5 hours is enough to drain the 18V low enough it stops charging. The battery tender is big. It does 4 amp charging. If I used a small milliamp charger, the 18V battery could go a lot longer. The converter also has a cooling fan. With the 4 amp charger, the cooling fan would start and run for several minutes. A previous test, over 2 hours, took the battery from 12.1V to 12.8V.
Wireless charging is possible!
