| Storage type | Specific energy | Energy density | Peak recovery efficiency % | Practical recovery efficiency % |
| Arbitrary antimatter | 89,875,517,874 | depends on density | | |
| Deuterium–tritium fusion | 576,000,000 | | | |
| Uranium-235 fissile isotope | 144,000,000 | 1,500,000,000 | | |
| Natural uranium in fast breeder reactor | 86,000,000 | | | |
| Reactor-grade uranium in light-water reactor | 3,456,000 | | | 35% |
| Pu-238 α-decay | 2,200,000 | | | |
| Hf-178m2 isomer | 1,326,000 | 17,649,060 | | |
| Natural uranium in light-water reactor | 443,000 | | | 35% |
| Ta-180m isomer | 41,340 | 689,964 | | |
| Metallic hydrogen | 216 | | | |
| Specific orbital energy of low Earth orbit | 33.0 | | | |
| Beryllium + oxygen | 23.9 | | | |
| Lithium + fluorine | 23.75 | | | |
| Octaazacubane potential explosive | 22.9 | | | |
| Hydrogen + oxygen | 13.4 | | | |
| Gasoline + oxygen | 13.3 | | | |
| Dinitroacetylene explosive – computed | 9.8 | | | |
| Octanitrocubane explosive | 8.5 | 16.9 | | |
| Tetranitrotetrahedrane explosive – computed | 8.3 | | | |
| Heptanitrocubane explosive – computed | 8.2 | | | |
| Sodium | 7.0349 | | | |
| Hexanitrobenzene explosive | 7 | | | |
| Tetranitrocubane explosive – computed | 6.95 | | | |
| Ammonal | 6.9 | 12.7 | | |
| Tetranitromethane + hydrazine bipropellant – computed | 6.6 | | | |
| Nitroglycerin | 6.38 | 10.2 | | |
| ANFO–ANNM | 6.26 | | | |
| Lithium–air battery | 6.12 | | | |
| Octogen | 5.7 | 10.8 | | |
| TNT | 4.610 | 6.92 | | |
| Copper Thermite | 4.13 | 20.9 | | |
| Thermite | 4.00 | 18.4 | | |
| ANFO | 3.7 | | | - |
| Hydrogen peroxide decomposition | 2.7 | 3.8 | | |
| Li-ion nanowire battery | 2.54 | 29 | | 95% |
| Lithium thionyl chloride battery | 2.5 | | | |
| Water | 1.968 | 0.708 | | |
| Kinetic energy penetrator | 1.9 | 30 | | |
| Lithium–sulfur battery | 1.80 | 1.26 | | |
| Fluoride-ion battery | 1.7 | 2.8 | | |
| Hydrogen closed cycle fuel cell | 1.62 | | | |
| Hydrazine decomposition | 1.6 | 1.6 | | |
| Ammonium nitrate decomposition | 1.4 | 2.5 | | |
| Molten salt | 1 | | | 98% |
| Molecular spring | 1 | | | |
| Lithium metal battery | 0.83-1.01 | 1.98-2.09 | | |
| Sodium–sulfur battery | 0.72 | 1.23 | | 85% |
| Lithium-ion battery | 0.46–0.72 | 0.83–3.6 | | 95% |
| Sodium–nickel chloride battery, high temperature | 0.56 | | | |
| Zinc–manganese (alkaline) battery, long life design | 0.4-0.59 | 1.15-1.43 | | |
| Silver-oxide battery | 0.47 | 1.8 | | |
| Flywheel | 0.36–0.5 | | | |
| 5.56 × 45 mm NATO bullet muzzle energy density | 0.4 | 3.2 | | |
| Nickel–metal hydride battery, low power design as used in consumer batteries | 0.4 | 1.55 | | |
| Liquid nitrogen | 0.349 | | | |
| Water – enthalpy of fusion | 0.334 | 0.334 | | |
| Zinc–bromine flow battery | 0.27 | | | |
| Nickel–metal hydride battery, high-power design as used in cars | 0.250 | 0.493 | | |
| Nickel–cadmium battery | 0.14 | 1.08 | | 80% |
| 0.13 | 0.331 | | |
| Lead–acid battery | 0.14 | 0.36 | | |
| Vanadium redox battery | 0.09 | 0.1188 | | 7070-75% |
| Vanadium bromide redox battery | 0.18 | 0.252 | | 80%–90% |
| Ultracapacitor | 0.0199 | 0.050 | | |
| Supercapacitor | 0.01 | | 80%–98.5% | 39%–70% |
| Superconducting magnetic energy storage | | 0.008 | | >95% |
| Capacitor | 0.002 | | | |
| Neodymium magnet | | 0.003 | | |
| Ferrite magnet | | 0.0003 | | |
| Spring power, torsion spring | 0.0003 | 0.0006 | | |
| Storage type | Energy density by mass | Energy density by volume | Peak recovery efficiency % | Practical recovery efficiency % |