I just got a 5000mah 40c 3s hardcase last weekend and all I can say is WOW. this battery is worth every penny. I have tried several other reputable brands even other companies with the same exact ratings don't hold a candle to the gens ace. Battery came perfectly balanced in storage mode. Is still balanced after a run and charges balanced. I will have a hard time buying a battery from any other company as this one is 30% better than all my other batteries.