Energy　conservation　or　energy　balance　in　the　process　of　data　gathering　has　always　been　a　crucial　issue　for　prolonging　the　lifetime　of　wireless　sensor　networks　(WSNs),　especially　on　the　premise　of　the　introduction　of　mobile　elements　to　cope　with　the　phenomenon　of　hot　spots　or　energy　holes.　In　this　paper,　we　propose　optimal　cluster-based　mechanisms　by　a　modified　multi-hop　layered　model　for　load　balancing　with　multiple　mobile　sinks　for　these　problems.　Furthermore,　under　the　condition　of　a　delay-tolerant　application,　rendezvous　points　(RPs)　and　rendezvous　nodes　(RNs)　are　utilised　to　realise　the　goal　of　optimal/suboptimal　energy　consumption　in　the　sense　of　energy　transmission　model　through　a　heuristic　algorithm　in　a　geometrical　way.　To　further　reduce　the　consumption　of　network　energy,　quantisation　technologies　are　exploited.　As　a　result,　we　analyse　the　cluster　lifetimes　in　different　situations　and　achieve　balance　to　save　significant　energy.