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It depends, if you are using regular Alkaline batteries, those are known to go dead really fast. Better if you try some rechargeable batteries with a rating of at least 2100mAh, anything smaller than that will drain just as quick as Alkalines.
I'm afraid this is nothing unusual. Many helis run the same amount of time. Unless you have modified your battery setup you will be using nimh batteries and they are renowned for losing power and storage ability whilst not in use. You give almost no information so it's impossible to give any definite answers. How old is the battery? are you charging it with the correct charger? How fast did you run the heli? I ran two of the exact same helis only yesterday and I was lucky to get both of them off the ground three times before the batteries died and when Nimh die they just die very fast with little warning. Perhaps you could reply with more information as to the age of the battery etc as above. Just remember that batteries only have a limited life and with poor maintenance their lifecycle drops dramatically.
Possible you have an earth wire loose ( contact wiring.) Loose battery terminals. Please start the checking from battery side and carefully not to cause any unexpected spark. That might cause a serious damage to ECU etc, My technical advise better a Car Electrician to do the job for your benefit.
I would check the alternator again, it apparently isn't charging the battery with engine running. You need a volt meter or amp meter to test this. Also does the battery discharge when the car is not running?
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