NOVELTY - The device (10) has a battery cell arrangement (14) accommodated within a battery housing (12) for providing a low battery voltage (U1) and a high battery voltage at a first battery terminal (A1, M1) and a second battery terminal, respectively. The arrangement is connected with a direct current (DC)/DC static converter (16) for provision of another low battery voltage (U2) and the former low battery voltage to a third battery terminal (A2, M2) and the first battery terminal, respectively. The first, second and third terminals are arranged on an outer side of the housing.    USE - Electrochemical energy storage device such as 12-volt starter battery e.g. lead acid starter battery, nickel-metal hydride starter battery, nickel-zinc starter battery, lithium-air starter battery, zinc-air starter battery and lithium-ion starter battery, for storing electrical energy in an onboard power supply system that is utilized for supplying the stored electrical energy to a component e.g. Otto engine starter and diesel engine starter, of a vehicle such as land vehicle e.g. electrical car and hybrid car (all claimed). Can also be used for supplying electrical energy to a bicycle light, a car radio and a seat heater.    ADVANTAGE - The cell arrangement is connected with the DC/DC static converter for provision of the two low battery voltages and the former low battery voltage to the two battery terminals, respectively, where the terminals are arranged on the outer side of the housing, so that the same battery is supplied with the different voltages, thus avoiding utilization of an additional battery, and hence reducing cost of the battery while reducing electrical losses at the battery. The battery enables rapid and efficient starting of the starter.    DESCRIPTION OF DRAWING(S) - The drawing shows a simplified block circuit diagram of an electrochemical energy storage device in a form of a battery.    Battery terminals (A1, M1, A2, M2)    Low battery voltages (U1, U2)    Electrochemical energy storage device (10)    Battery housing (12)    Battery cell arrangement (14)    DC/DC static converter (16)