Power Tree UPS PT1250M schematic needed

[amitms]

Can Anybody please help me out with circuit diagram, schematic or just picture of internal wiring connection of POWER tree ups (model PT1250M ).

Actually i am trying out connecting high AH battery to increase backup and use in Household wiring . 1250 will give max power of 700 watt (assuming 80% full load will support approx 500 w easily.) i will provide the details later.

Search everywhere but couldn't find any even not pictures .

Thanks . !!!.