Energy buffer:

• Cradle-to-grave energy efficiency
  • Lifetime: longer lifetime increases cradle-to-grave efficiency by amortising energy needed to manufacture and recycle the battery. See Cell degradation.
• The impact categories of raw material production for batteries
• Recyclability

Vehicle's energy source:

• Capacity
• Power density (especially charge); not relevant in case of battery swapping
• Reliability
  • Consistent and predictable remaining capacity at all temperatures and times
  • Battery keeps working if one cell or module doesn't work

Constructive part of the vehicle:

• Volume (hence energy density)
• Weight (hence specific energy)
• Stiffness
• Battery safety
• Form
• Maintainability and repairability

Cost part of the vehicle:

• Cost (capex)
• Insurability (battery provides information needed to price insurance optimally)
• Opex: price of IoT connectivity, maintenance contracts (depending on how complex maintainability usually is)
• Price of repairment, replacement of a battery component or the battery as a whole