making 7 cell packs for emaxx

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I bought a new emaxx ( arriving tommorrow, I'll be on the porch wagging my tail --- wait , I had that removed when I was little) and ordered 4 orion vmaxx super duty 2400 nicads. i know these aren't the best batteries but i'm not going to race this thing just see what i can climb!!!! But i did want to make 2 7 cell packs so i finally found at batterystation.com 2 sanyo 2400 scr's for $3 each. Does anyone know if the vmaxx packs are sanyo's and will these high capacity scr's work well by adding them to the vmaxx packs. I don't know the difference of scx and scr. is it how fast or how much amps they discharge during running.:C: