Should fit alright, you might have to shave a couple of "nodules" ( I like that word) off the battery bar though on the zx5.
The orion pack is just a nicely packaged pair of 3.6v cells. You can get the actual cells naked which is what I have driven before. They are a lot lighter than a normal battery pack (the orion pack is heavier of course) seemed ok to me from a performance standpoint.
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