i encountered the same problem also. parked for 20 min for dinner, came back , engine couldnt start. managed to get help from another driver to jump start. thought everything fine, 2 days later when i rushing for my marathon run the car couldnt start again. after the run get my friend to jump start, the battery flat again when i stopped engine 15min for lunch. in the end call TCM mobile to change the spoilt battery. damaged $110. was told the battery can last about 400k km only.