hey i have a better battery then the optima yelow top i have a stinger yellow high end battery ill have to look at it later to get a part number i bought it for the system in my caprice used it 2 days then took it all out and sold the car i also have 2 brand new 12'inch 12's still in the boxes or i dont have a pocket bike but i have a older 90s later 80s honda xr80 dirtbike let me know youc an just give me a call anytime you want im sure i have more things laying around id just have to dig through the garage let me know somthing though 772-360-8460 chris