NOVELTY - The unit has a flexible tubular housing made of a semi-rigid tube for receiving a pair of series connected battery cells, and a microchip connected to the battery cell. A color display is connected to the microchip, and evaluates a charge level of the battery cell when the battery cell is positioned in the housing. The display indicates the charge level, and communicates the charge level, capability and identification of the unit to an energy management system that is installed on a computer (11).    USE - Modular energy accumulation unit for harnessing electrical energy from a small wind turbine, a solar panel, small emergency generator and local electricity utility, in a residential household to transfer energy to a battery operated application e.g. motorized bicycle, exercise bicycle, electric scooter, automobile and lawn mower. Can also be used for businesses and factories.    ADVANTAGE - The energy accumulation unit improves harnessing of electrical energy from low efficiency or intermittent energy sources, and allows for the rapid transfer of the harnessed energy to mobile battery operated applications. The energy management system maximizes the efficiency of the collection, storage and use of energy. The ends of the housing have different geometries to prevent polarity inversion of the unit. The unit is easily manipulated so that a user rapidly exchanges a series of depleted units. The housing is flexible, thus integrating the series of batteries in small, space limited applications.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a modular accumulation and storage system comprising a charger.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a modular energy accumulation and storage system used in a residential household for accumulating and harnessing electricity from various energy sources.    Automobile (9)    Charging box (10)    Computer (11)    Wind turbine (12)    Solar panel (13)    Small emergency generator (14)    Local electricity utility (15)    Wide area network (16)    Household (17)    Control switches (18)    Electric contacts (20)    Transformers (21)