I run R/C cars and am trying to come up with a way to make a smal gadget. What I am trying to make is a small device that monitors my battery discharging. A little more details: I made a light bulb discharger for my batteries. THis is a row of 10 1156 auto bulbs wired parrellel(all pos. together, all negs. together) with a plug on the end. THis will drain an R/C battery pretty well and rather quick. The gadget I am trying to make will be hardwired to the bulb discharger and have the connector for the batery on the other end. It needs to "monitor" what voltage the battery is(or is letting out) and cut it off at a certain voltage. It is not good for the battery to go below 5.40v(for a 6 cell pack) so I would like it to cut-off around 5.40-5.80 or so.... Granted you can buy these at most larger hobby stores, but I am a person that like to make things! /forums/images/graemlins/smile.gif Can anyone help me out and guide me in the right direction? Thanks!!!!