I finally pulled out my X Star Premium after letting it sit for 18 months plus and one of the 2 batteries I have would not charge. The green power light would just blink. I followed the directions on on of the battery threads used my DC power supply to put 6 volts for 10 sec, then 8 colts for 10 sec, and then 12V for 10 sec. I attached it to the Autel charger and it charged up! Just put it in the drone and it it shows 98 percent battery life. Shall see what it does once I fly it....thanks for the info....
Mark
Mark