Loads not really good

After unpacking, I clamped the equipment into an outlet and wanted to charge the battery. Then flashed the red charging light in the interval and the green indicator for charging mode shone consistently achieved. This did not change even after three hours. I then again all connections checked, pulled the plug again and then it worked. Red charging light stops blinking but ran quietly and began with the store on. After 1 hour, the green light indicates a full battery. Battery into the model car and off we went. After about 10 minutes of driving pleasure was too late because the battery was empty. All very weird. I then more malls loaded and despite green light after just 30 minutes. Now the battery lasts longer. Have the unit still sent back and replaced by a besserers since the operation has not convinced and also a discharge function and a car is missing loading facility. If the device no longer buy.