i mean if You are a DIYer You can "copy and paste" this project this is 12s2p extender, 24 18650 cells and smart BMS perfecly fits this fidlock bag ,I m using dual battery converter from Aliexpress that alows me conect and disconect at any time
not possible tachnically i think 410wh battery 12s2p so only 2cells working together when you load 500w at only two dischcharged cells voltage drops dramaticly ,bms cut off voltage and ride finished :)