I had bought the first kit, and was a bit suprised that the battery, even though it lasted a while, died completly and I was lefr not knowing what to do... Then after many mails trying to understand what was wrong, I was told it was dead and had to sped more 300,00 EUR on a new one. I did and I'm not sory but: It has a strong power but fades rapidly. I would like the option of less power for more distance, for when I'm on a leveled place the power is to much and could be saved. Also, the new power lever has a different notion of how much power is on the battery because they display different measurements. But still, I'm happy with it. Just would also like to have an estimate of how long it will last and if next time it wont be so difficult to get a new battery.