title_body: LiPo 4S battery's output voltage higher than 14.8v
upvoted_answer: As others pointed out, 16.8 volt is what that battery should be reading (unless there is a specific chemical composition that makes that different).
  Discharging a battery to use with your application is an anti-pattern, please avoid.  Put a voltage regulator in there with the correct amp rating (draw) and you will be all set.
  Pololu has some 1-2a 12v step-downs that cost $3-10. You can also go adjustable, here is a 9-30v 1 amp step up/down.
  I know a few good ones on Amazon. Bottom line, this is a common part, easy to use, and I have had high reliability for nearly identical situations.