A:AnswerI'm 300 pounds and I rode my friend's 300 watt, and while I couldn't go as fast as he could, it worked pretty well. I bought the 800 watt model and it got here today. I expect it will carry ne much better (I got it today and it's charging as I write this.
A:AnswerIN general:
lead acid batteries: keep fully charged
NiCd: keep fully discharged
NiMH: doesnt matter too much but 50% is good idea for storage. (they self discharge fairly quickly)
Liion: keep battery between 40 and 60 percent charge for storage. don't fully discharge if possible, and use right away if fully charged.