Batteries are needed to operate grid-independent electrical devices. The disadvantages of conventional batteries (high weight, limited performance, problematic disposal) have long been seen as principle obstacles towards an environmentally friendly power supply.

The opposite is actually true. There are numerous energy storage technologies: electrochemical (lead, nickel-cadmium, lithium batteries), electrostatic (super-capacitors), electromechanical (flywheels and compressed air), thermochemical (hydrogen fuel cells).

As air travel and mobile phones have shown, batteries can be matured and function economically. If the widespread electric stand-by or stand-alone devices were fitted with photovoltaic cells and built in batteries or super-capacitors and if customary batteries were recharged with solar charging devices (for example, a thin-layer solar module), it is estimated that in Germany alone four nuclear power plants would be superfluous.

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