Original Nintendo 3DS Battery (1300mAh): 4h 13min (1.00x)
This 5000mAh battery: 16h 0min (3.79x)
So were promised me a long playing time ~ 3.84 / battery capacity. With the 3,79x is no cheating here! Excellent!
The 3DS is thicker by the battery even a piece. I see the positive because the 3DS is not ergonomically yes. In total ~ 8-9mm added and is thus much better in your hand!
However, yesterday, I have to deduct:
The cover, there are unfortunately only in gray and rather cheap plastic (feels light and thin to).
However, while looking at naked the quality does not stand out. I hope the cover keeps the battery without any problems for years to come firmly!