I should probably power my laser drill as well, but I'm worried that the precharger would use too much of my energy that my magmatic dynamos are producing, thus getting in the way of powering my other devices.
Each pre-charger will drain a max of 2500 rf per tick. If you want to limit this, you can place an energy cell as a buffer between your power network and the pre-charger and set the max input to a lower value to keep it from robbing the rest of your power system. It will of course run slower, but it will run constantly without having to check on things.