hey this is rick that sold you the yak .. i have some batts. for sale for you if interested 1 4cell 2200 25c and 2 2cell 2200 25c that you can make into a 4cell. also have a gws a4 that has a 700 watt. power system .it has a castle bec,75amp 6cell speed control,and hs85 servos,berg reciever,ready to fly all you need is a crystal ...i`ll sell it all for 200.00 or if just the batts. 100.00 let me know if your interested