Shrink Wrapping is pretty expensive. I did mine with "electric tape" (the black tape), and is holds my battery very tight. It might not look as professional, but you'll have 15$ more in your pockets.
And if you are doing your pack yourself, be 100% sure of plugging it the good way. If your motor is inverted, the piston will be pushed by the gears towards the cylinder head (which it is already touching), so you can say "byebye gearbox".
Kymoz
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