Energy depletion in battery powered Wireless Sensor Networks (WSNs) causes coverage gaps and can eventually lead to the complete failure of the network. Mobile charging robots (MCRs) can be used to replenish energy and maintain the continuity of the network. Most existing work in this area assumes that MCRs are reliable in their operations; however, in real-world scenarios, robots may malfunction or deliver incomplete charges. We propose a trust-based MCR selection mechanism that allows sensors