A heavy cell is a powerful energy cell used to power light vehicles and heavy weapons. It can power a typical applieance for the lifetime of the device, but can be dischaged quickly when used for a high-energy device, such as an energy weapon.
A heavy cell can be reloaded in a day from a standard electrical utility or in six hours from a starship power plant or industrial utility.
It is a cube about 15 cm to the side and weights 2 kg.