Not charging when plugging in the charger, but the LEDs turn on

i took the battery while the power was connected , the charger is brand new , the battery was out in the past but used to worke untill i took out the batery to check the cells inside :) after putting it back together i still get the charge led on the battery but no charging from the mac

So you took the battery apart then, correct?

correct and check each cell , which they were ok , put it back together , geting the voltage of 12 at the ends , puting it back to laptop to see how it does the orang light comes up for 10 seconds then goes green and no change after no matter if i remove the battery power down the laptop doing a restart on all pram vram sram whateverram :D , im a med student but i have a hand in electronics so i know i havent messed up the wiering of the battery :)

I would recommend you get a second battery unit and give that a try. Your battery was most likely on its last legs anyway given the age of the system.

thank you dan for the advise but the thing is when i click on the battery LED it comes up as 3 light ! and when i check the battery cells itsell they are looking realy fine , i just want to try all the fixes befor buying a new battery as the new battery price is equall to this system :)