Sorry guys, I have been at work.<div>The Batt. are the same .HydriMax 750 mAh  NiMH 4.8 V . that I need to put in tail for C.G.</div><div>My fear is how small this pack is . And how NiMH batteries can go from full charge to dead before plane can be landed. </div><div>The plane is a  ARF  Kyosho  540 Edge with a 55 OS engine that I am setting up for someone else . </div>