With　the　ever-increasing　demand　for　power　sources　of　high　energy　density　and　stability　for　emergent　electrical　vehicles　and　portable　electronic　devices,　rechargeable　batteries　(such　as　lithium-ion　batteries,　fuel　batteries,　and　metal-air　batteries)　have　attracted　extensive　interests.　Among　the　emerging　battery　technologies,　metal-air　batteries　(MABs)　are　under　intense　research　and　development　focus　due　to　their　high　theoretical　energy　density　and　high　level　of　safety.　Although　significant　progress　has　been　achieved　in　improving　battery　performance　in　the　past　decade,　there　are　still　numerous　technical　challenges　to　overcome　for　commercialization.　Herein,　this　mini-review　summarizes　major　issues　vital　to　MABs,　including　progress　on　packaging　and　crucial　manufacturing　technologies　for　cathode,　anode,　and　electrolyte.　Future　trends　and　prospects　of　advanced　MABs　by　additive　manufacturing　and　nanoengineering　are　also　discussed.