Lithium batteries based on multivalent chalcogen conversion chemistries offer a promising route toward high‐energy, practical energy storage, but their development is impeded by the limited accessibility and instability of high‐valence intermediates. Here we report a quasi‐solid‐state lithium||tellurium battery in which a zwitterionic gel polymer electrolyte (GPE) stabilizes multivalent tellurium redox, enabling reversible six‐electron conversion under practical conditions. By embedding LiCl directly into a Te cathode, we establish a Te/LiCl composite that activates the sequential Te ² ⁻ /Te ⁰ /Te ²⁺ /Te ⁴⁺ redox cascade with three well‐defined discharge plateaus at 2.42, 2.17, and 1.76 V. This multivalent conversion delivers a high specific capacity of 938 mAh g ⁻ ¹ and an energy density of 619 Wh kg ⁻ ¹ based on the whole cathode. To suppress dissolution and decomposition of high‐valence Te ⁿ⁺ species, we design a zwitterionic GPE that provides dual‐ion (Li ⁺ /Cl ⁻ ) transport, robust Li metal compatibility, and effective confinement of soluble intermediates. The resulting quasi‐solid Li||Te/LiCl cells exhibit excellent rate performance and long‐term durability (87.6% capacity retention after 400 cycles at 1 A g ⁻ ¹ ), and achieve an areal capacity of 5.4 mAh cm ⁻ ² . This work establishes a zwitterion‐stabilized, multivalent Te redox platform that bridges high energy density with practical cycling stability, offering a generalizable strategy for advanced conversion‐type lithium batteries.

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