An electricity storage system that can be used for emergency power in the event of a power failure which is the biggest risk in our electrified society. Besides a function which simultaneously recharges 10 smartphones which are crucial for communications and information acquisition in case of an emergency, it is compact and portable and can be easily carried around when the need arises, meaning it can be used in an office, a shop and at home on a daily basis. Not only in emergencies, but using it every day contributes to a reduction of the environmental burden. It can also be recharged by solar cells (renewable energy), making it ready for a long-term power failure.