Abilities » Battery | Abilities » Ruler of the Night
Would Honchkrow GX's "Ruler of the Night" Ability prevent me from using Charjabug's "Battery" Ability to attach it to Vikavolt as an Energy card?
Yes it would prevent that because Charjabug would be a Special Energy card being played from your hand.
Source: Unbroken Bonds FAQ (2019-04-19), TPCi Rules Team (2019-05-02)
Abilities » Battery
If I use Charjabug's "Battery" ability, is that an extra Energy card attachment or does it count as my one attachment for the turn?
It is an extra Energy attachment. You still get to attach one other Energy card as your normal attachment for the turn.
Source: TPCi Rules Team (2019-05-02)