Lego Mindstorms EV3 Battery Cover for Lipo Rechargeable Pack

This is a remix from thing http://www.thingiverse.com/thing:2021779 . I changed it a little to have better electrical poles holders and get rid of all the supports. I hate that EV3 drains batteries very fast and that by default Lego did not included a rechargeable battery pack ( you can buy separately for around 100$...!!!).... So here there is the better and cheaper solution! Adding a 2s Lipo pack ( in my case 1300mah but you can go over 2000mah) that will give all the power needed and is very easily rechargeable every time you want! just unplug the cable that sticks out, plug it to the charger and go! I used the metal electric contacts from an old toy, they work great! I printed flat with external side on table, but you can try to print it in standing position.