In this report, we have demonstrated the fabrication and detailed characterization of room temperature pseudo-solid state batteries containing Li anodes and FeF3 conversion cathodes that operate at high current density (1.0 mA cm -2 ). The improvement over prior work, which required elevated temperatures to achieve similar performance, is enabled by our use of a conformal PVDF-HFP gel filled with a localized high concentration electrolyte (LHCE). We attribute this improvement to the ionic conductivity of the LHCE-filled gel (1.92 mS cm -1 at 25°C), which exceeds that of the latter by up to two orders of magnitude. In addition to room temperature operation, the LHCE gel prevents side reactions and is stable with both the Li anode and FeF3 cathode, as evidenced by coulombic efficiencies >98% for Li-FeF3 full cells, Li half-cells, and FeF3 half-cells.