Portable Battery Pack is a Continuous Trap Card.
Trap Cards are normally Set first and can be activated on a later turn, often in response to an action.
On the current TCG and OCG Forbidden & Limited lists tracked here, Portable Battery Pack is Unlimited.
YGOPRODeck lists Portable Battery Pack for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
Portable Battery Pack belongs to the Batteryman archetype—use that tag when searching for engine pieces and tech options.
A listed print of Portable Battery Pack appears in Light of Destruction (LODT-EN074) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Portable Battery Pack is about $0.07 on Cardmarket (prices change frequently).
