Video by QULBIX Performance Electric Bikes via YouTube
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If you want to build your own battery with 18650 or 21700 li-ion cells, you can print the template of the frame opening on A4 in 1:1 scale and you are ready to go. Just make sure to leave some space around the perimeter for insulation, padding and wiring. If you are not expert, do not attempt to assemble battery packs on your own (!). You can buy a ready-to-instal batteries from Qulbix.
Link to template pdf file: https://qulbix.com/wp-content/uploads/2024/02/Q76_FRAME_KIT_BATTERY_OPENING_2023-24.pdf
Qulbix shop: https://qulbix.com/shop/