On the 511 there is @68.7mm between posts. The problem guys is the height though, and the rear of the centre bulkhead! So sorry, but 23mm is too high, mine are 22.8 and are too high!! To get round it you either need to move the battery back (which will mean it covers the screw hole for the rear battery post) or sit it further out over the undertray to the side! No way round it!
Maybe a pack that's short enough will have space to move back and still have A battery post (not the Tamiya as it's too thick!) there, or just put the rear battery post in the holes further back for screwing the undertray to the car. The latter is my prefered option but it would need longer carbon battery straps and I don't have any carbon to try!
Will post pics tomorrow of what I mean!
BTW, I need to check but I think the battery's are further forward in the 511 and that's why the bulkhead becomes an issue? I'll check on my 501!
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