Yes, that is possible. There are a couple of options:
1) Use SimPowerSystems Simscape Components. The blocks in this library are Simscape compatible, and there is a battery block that may suit your needs. Alternatively, you can download a battery cell block from here:
and parameterize its equivalent circuit using experimental data if you have it using Parameter Estimation.
2) Use the Interface Elements in the SimPowerSystems Specialized Technology library. Those blocks allow you to connect SimPowerSystems Specialized Technology with Simscape blocks.
Please let me know if this answers your question.