Advanced Warfare MP introduces the new Exo-Abilities which gives your player a special ability that you can select in the Pick 13 system. Michael Condrey has tweeted out confirming that the battery for these abilities don’t recharge; you get one battery use per life, which makes the overall usage balanced.
@RuggedSavior none of them recharge. They are all based off a battery that drains on use. The battery is per life.
— Michael Condrey (@MichaelCondrey) August 22, 2014
Exo-Abilities allow you to augment your Exo; learn more about the Exo-Abilities here.