The　performance　of　a　asymmetric　(single-side)　pasted　positive　plate　was　studied　by　measuring　the　current　density　and　potential　distributions　on　both　sides　of　the　plate.　It　was　found　that　the　current　densities　on　both　sides　are　almost　the　same　during　the　early　discharge　at　the　3　C　discharge　rate.　As　the　discharge　proceeds,　the　current　decreases　gradually　on　the　non-pasted　side　and　increases　on　the　pasted　side.　Since　more　active　mass　exists　on　the　pasted　side,　the　matrix　resistance　is　higher,　causing　the　polarization　to　increase　by　55-90　mV　at　the　3　C　discharge　rate.　On　the　non-pasted　side,　the　active　mass　undergoes　a　deeper　depth　of　discharge　(DOD).　This　leads　to　the　shedding　of　active　mass,　which　shortens　the　battery　life.　Since　the　positive　grid　on　the　non-pasted　side　is　exposed,　its　corrosion　rate　is　faster.