I can think of the following factors, and having constructed this list, it is a lot easier to analyze the issue of the future of car batteries.
- Cost [of the battery, of course].
- Capacity [to store energy]. Capacity is inverse of size, since you can always increase capacity by combining battery packs. So capacity here refers to capacity while keeping size constant.
- Charging time
- Power capacity - how fast can a battery deliver power.
- Commercializability - the ease and practicality with which a battery can be manufactured at scale.
- Energy efficiency - what percentage of input energy is retained [and delivered] by battery.
- Life - in terms of both number of charging/discharging cycles and time [years].
- Safety - what happens if the vehicle meets with an accident? Toxic? Fire hazard?
- Self-discharging - how quickly does the stored energy deplete when the vehicle isn't being used.
- Weight - closely related to capacity and size, but size and weight are two different things, and we want both to be small.
- Recyclability - can the battery be recycled easily, fully and profitably? What environmental risk do the non-recyclable components pose, and what is their recommended disposal method?
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