?? Batteries for neu 1515 1yf, quark 125 G2R

:032: i will be racing my g2r only. and am running with other truggies so i need good run time. does anyone know if the A123racing lithium ion batteries are a good choice. they seem to be popular among the brushless plane crowd. with adjustable voltage 7.2 to 10.8 They state a full charge in like 15 minutes so i'm thinking i could run the same packs all day. Is this too good to be true? any advice is greatly appreciated