Just an additional note on the Sensei while it comes with one three cell Lipo 2100 mah or similar I would reccomend planing to buy at least one additional flight battery and better yet two additional packs. There is no need to start experimenting with higher capacity packs and the fellows often get hung up fixating on excesssively long flights.

All the learning takes place in the first few minutes of each flight and dragging on with excessively long flight will accomplish nothing. Far better to keep the flights short and many multiple flights. That means more than just one battery each time you go out and all charged up and ready.

John