Flexible　batteries,　seamlessly　compatible　with　flexible　and　wearable　electronics,　attract　a　great　deal　of　research　attention.　Current　designs　of　flexible　batteries　struggle　to　meet　one　of　the　most　extreme　yet　common　deformation　scenarios　in　practice,　folding,　while　retaining　high　energy　density.　Inspired　by　origami　folding,　a　novel　strategy　to　fabricate　zigzag-like　lithium　ion　batteries　with　superior　foldability　is　proposed.　The　battery　structure　could　approach　zero-gap　between　two　adjacent　energy　storage　segments,　achieving　an　energy　density　that　is　96.4%　of　that　in　a　conventional　stacking　cell.　A　foldable　battery　thus　fabricated　demonstrates　an　energy　density　of　275　Wh　L−1　and　is　resilient　to　fatigue　over　45　000　dynamic　cycles　with　a　folding　angle　of　130°,　while　retaining　stable　electrochemical　performance.　Additionally,　the　power　stability　and　resilience　to　nail　shorting　of　the　foldable　battery　are　also　examined.　©　2018　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim