The　tubular　positive　plate　formation　in　lead-acid　batteries　has　been　studied　by　an　in　situ　electrochemical　scan　technique　to　measure　the　current　and　potential　distributions.　The　distributions　of　the　current　density,　potential,　and　polarization　resistance　were　uneven　in　the　earlier　stage　of　the　formation.　This　is　attributed　to　the　conductivity　of　the　positive　paste.　The　formation　of　the　tubular　positive　plate　can　be　divided　into　three　stages　according　to　the　polarization.　The　first　stage　is　before　inputting　similar　to　50%　the　charge　amount,　in　which　the　conductivity　of　the　paste　is　dominant.　After　that,　the　positive　polari　＇　zation　depends　on　both　the　conductivity　and　the　electrochemical　reactions　in　the　formation　process　between　about　50　and　80%　charge　amount.　Finally,　the　electrochemical　reactions　become　dominant.　The　charge　amount　of　different　parts　was　also　uneven　in　the　entire　formation,　which　was　determined　by　the　distribution　of　the　current　density　in　the　initial　stage　of　high　current　charge.　(c)　2005　The　Electrochemical　Society.　[DOI:　10.1149/1.1859712]　All　rights　reserved.