So we're at a point that the whole upgrade was done, tested and prototyped. It works. I'll start commuting with that and work on the next steps :

• Find the right BMS+Charger approach
  • Provisory 5A/3h charger is already here
    • This guy actually gave me 1:30h of charging time. Not buying that it's doing 5A, but it's tricky to measure without the proper tools.
• Design an aluminum case for the batteries + BMS
  • This will be a digital design I'll share here.
  • This should have a rail system counterpart to live inside of the bike. Should reduce battery removal/insertion from time from 2~3 min to < 30s.
    • Battery should fit the front port, protected from a key, very easy access. Picture to follow.