<p>Li₇La₃Zr₂O₁₂ (LLZO) is a promising garnet-type solid electrolyte, but the interfacial issue between LLZO and common electrode materials has inhibited its implementation in all-solid-state lithium-ion batteries. We hypothesized that a battery with all the cathode, electrolyte, and anode based on the garnet-type composition, e.g., Ta-doped LLZO or LLZT, could alleviate some interfacial problems. In this work, we presented the first all-garnet-type solid-state lithium-ion battery utilizing Ni-doped LLZT, LLZT, and Ti-doped LLZT as cathode, electrolyte, and anode, respectively. We found the battery could maintain a ~ 2&#xa0;V voltage and be charged/discharged for 25 cycles. We applied the three-probe characterization to separate the cathode, electrolyte, and anode contributions and found both the electrolyte and interfacial resistances are relatively stable during cycling.</p>