A battery (in everyday life) is a power source for electrical appliances that does not have the property of recovery, that is, the charging function.
In fact, from a technical point of view, a battery - is a group of series and / or parallel-connected current sources, including battery cells.
However, in everyday speech, it is the battery that is understood to be devices capable of delivering electrical current, but not capable of restoring its voltage (the difference between the minimum and maximum value of which can be taken as the capacity of the battery). That is, from this position, the battery differs from the accumulator in its disposability.
Accumulator (in everyday life) is a power source for electrical appliances that can restore its charge with the help of special devices that charge power supplies.
In fact, accumulator is a reusable device capable of delivering electrical current, the hallmark of which is the reversibility of the discharge process, manifested in charging the device and re-accumulating energy.
It follows from this that a accumulator differs from a battery precisely in its ability to restore its charge level.