Energy storage/specs
| Type | Specific energy (watt hours per kg) |
Specific power (watts per kg) |
Charge time (minutes) |
Self-discharge (% per month) |
Roundtrip efficiency (%) |
Lifespan (charge-discharge cycles) |
Lifespan (years shelf life) |
|---|---|---|---|---|---|---|---|
| Lithium-ion batteries | |||||||
| Lead-acid batteries | |||||||
| Iron-redox flow batteries | |||||||
| Flywheels | |||||||
| Hydrogen gas + fuel cell | |||||||
| Hydrogen gas + combustion engine | |||||||
| Hydrogen gas + combustion for heating only |