Question about Magicshine Monteer 6500S

What are your experiences with the Magicshine Monteer 6500S? My experience with it: The light is OK, operation also ...OK but the centrepiece, the battery of the Monteer 6500S, is a pure disaster! It has now completely died on me 3 times. During the warranty period, it was replaced each time, but now that the warranty has expired, neither Galaxus nor the manufacturer will offer any help. I would never buy Magicshine Monteer 6500S (I don't know about other models...) again and would not recommend it to anyone. Hands off it, disposable article!