In　this　paper,　it　is　the　research　topic　focus　on　the　electrical　characteristics　analysis　of　lithium　phosphate　iron　(LiFePO　4　)　batteries　pack　of　power　type.　LiFePO　4　battery　of　power　type　has　performance　advantages　such　as　high　capacity,　lower　toxicity　and　pollution,　operation　at　high　temperature　environment　and　many　cycling　times　in　charging　and　discharge　and　so　on.　The　charging　and　discharging　characteristics　for　LiFePO　4　batteries　of　power　type　pack　have　been　verified　and　discussed　by　the　actual　experiment.　Base　on　the　12V10AH　LiFePO　4　battery　was　proceeding　on　charging　and　discharging　test　with　over　high　current　value　and　which　investigate　the　parameters　such　as　the　internal　resistance,　the　related　charge　and　discharge　characteristics　of　LiFePO　4　battery　pack,　the　actual　value　of　internal　voltage　and　internal　resistance　of　the　battery　pack　and　by　polynomial　mathmatic　model　to　approach　the　accury　of　inner　resistance　on　discharging　mode.　©　2018　The　Authors,　published　by　EDP　Sciences.