Bottlebox battery case ? without battery

[alexis57]

Hi,
I'm looking for a case/box to fix in the water bottle screws but I didn't find any.
I made my own battery and I can make a new battery then I don't wanna buy a battery.
52 or 65cells.
Where can I buy these for cheap ? (100$ the case... no)
Should I make my own case ?
Thank you !

 

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You can find several case options here: http://bmsbattery.com/56-case