Aqueous　Zn-ion　batteries　utilizing　moldable　gel　electrolytes　are　expected　to　meet　power　requirements　for　wearable　devices　because　of　their　inherent　safety　and　energy　output.　Nevertheless,　comprehensive　modulation　over　the　mechanical　robustness,　water　retention　capability,　and　electrode–electrolyte　interface　stability　remains　at　a　nascent　stage.　Drawing　inspiration　from　the　naturally　cryoprotective　and　hygroscopic　properties　of　trehalose,　we　herein　devise　a　strategy　by　incorporating　trehalose　into　polyacrylamide　hydrogel　electrolytes,　targeting　the　construction　of　wearable　Zn-ion　batteries.　The　optimized　hydrogel　electrolyte　demonstrates　low-temperature　adaptability　(−15　°C),　high-temperature　stability　(50　°C),　and　water　retention　capability　while　helping　to　suppress　dendrite　growth　and　parasitic　reactions.　Theoretical　calculations　and　electrochemical　characterizations　reveal　that　trehalose　modifies　the　Zn-ion　solvation　structure　and　optimizes　the　electrode–electrolyte　interface.　The　thus-fabricated　Zn-ion　batteries　exhibit　favorable　electrochemical　performances　in　a　wide-temperature　range,　achieving　a　capacity　retention　of　87.2%　after　2000　cycles　at　5　A　g–1.　The　assembled　pouch　cell　could　also　be　sustained　for　more　than　500　cycles.　Moreover,　the　integration　of　our　Zn-ion　batteries　with　Si　solar　cells　to　construct　a　wearable　solar-charging　system　enables　an　energy　conversion　efficiency　exceeding　10%.　©　2025　American　Chemical　Society