Granite Arrma granite battery size dilemma


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Hi All

We have an Arrma granite and are looking at gensacearespammers LiPo 3s battery (6800mAH, 120C). The length of the battery is 157mm and the battery tray without the spacer is 157mm (I think).

We're worried if we buy this battery it won't fit in the battery tray. Will definitely be a squeeze but looks like absolutely no tolerance.
We are also looking at the compatibility for the battery - it list the big rock but can't see the granite. We are wondering if the big rock and granite share the same battery tray?

If anyone has any suggestions on whether the battery will fit or not please share - thank you :)