what sort of charger are u using and did u cycle it. i found that using a Swallow on my old battery didnt charge all the way so it was at about half, and my reciever would die after 5 min like you said. also you could try charging it at .5aMps and just let it charge it should take about 60-70min, my Venom 1400mAh took 80min to charge at .5aMps.