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This paper introduces a new battery-aware dynamic task scheduling approach for heterogeneous MPSoCs. A collector, a dc-dc converter and a battery module are introduced in the system. Additionally, a configurable and flexible load can be specified for modeling further components. Battery-aware modes of operation are newly introduced to extend battery lifetime. Therefore, processing element allocation, task scheduling and data transfers are dynamically performed with respect to the current battery status. In comparison to battery independent dynamic power management we are able to show that battery lifetime is extended.