There are some schematics going on in this forum. there is one included with the ubec as well.

It's a Ubec bytheway

on 12 cells the internal bec of the 20150 is more than fine. I used it on my maxx with 14 cells and the internel bec..(not recommended though) but it works.

Ok, sorry to bother you but what is a cutoff? Is it a On/Off switch. Also, I was told not to use an on/off switch because if you switch it off there is still juice comming from the batteries and if I get the lipos it will kill them and waste a lot of money.

Very true. An lvc is a cut off for the lipos so they don't get to far below their voltage. LVC= Low voltage cutoff. It will automitically cut the power so the lipos don't over discharge

Ok. Now that we know that, does the EBEC come with one or if not where do I get one.

And still isn't it better to just unplug the batteries.

ebec or ubec?

The one the Mike @ RC-Monster sells. External BEC/UBEC.

Well, yes, but the LVC shuts off when the cells reach a certain level. You'd have to know what your battery voltage is if you did it manually. By the time you notice a substantial loss in power, they could be discharged too far. The discharge curve of Lithium is pretty sharp near the end.

Also, a LVC doesn't cut power to the batteries (at least none I've seen do), it interrupts the throttle channel and sends a "stop" signal to the ESC when the batts get low. Most, if not all, ESCs still draw some power when plugged in even though the ESC is off. So it is ALWAYS recommneded to unplug the batteries.

Does my UBEC have the low voltage cutoff that you are talking about?

No, you need a seperate LVC, such as the liposhield from dimensionengineering