sir , Am using pixhawk 4

am using 3 sell battery so write on 3sells .

full voltage per cell how much i give = ?

empty voltage per cell how much i give =?

voltage divider ---------------- calculate. how to calculate please explain in detail

amp per volt ------------------ calculate . how to calculate please explain in detail

You can use the widget in QGC, it should make it a bit easier. You fill in what you know and it should calculate the rest for you.

Generally, the defaults should be good values for full and empty voltage per cell. E.g. 4.2 v for full and 3.5 v for empty.

ok then given . voltage divider how can calculate and amp per volt how can calculate

For voltage you measure the actual battery voltage with a meter then enter that number. The widget will determine the scaling factor and you just accept the new multiplier then check the measured voltage on qgc. I think the current is the same process but I’m yet to do this one. I will confirm when i do it