This blog is about Battery Energy Density
The energy density is the amount of energy that can be stored, per cubic meter of battery volume, expressed in Watt-hour per cubic meter (Wh/m3 ). This is a very important parameter to select a specific battery technology for transportation applications, where space availability is critical.
In fact, lithium-ion batteries’ energy density ranges between 260-270 wh/kg, while lead-acid batteries range from 50-100 wh/kg.
Li-ion batteries are capable of having a very high voltage and charge storage per unit mass and unit volume.
Current lithium-ion batteries store about 0.5 MJ/kg and have a theoretical upper limit of about 3 MJ/kg. There are other, theoretical chemistries beyond that, but it is unlikely that any will ever approach the energy density of hydrocarbons, at about 50 MJ/kg.