> For the complete documentation index, see [llms.txt](https://docs.shopnext.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.shopnext.io/whitepaper/how-to-play/what-are-nft-cards-bonus-cards/recharge-nft-cards-bonus-cards.md).

# Recharge NFT cards (bonus cards)

<figure><img src="/files/cVV43gb3pk0EtnvQYWHV" alt=""><figcaption></figcaption></figure>

A fresh new minted card will have 100% power by default. After each transaction, the power of the card will decay depending on the Capacity point of the card.

$$
PowerDecay=f(Capacity)
$$

$$
CurrentPower=100 - PowerDecay
$$

Recharging the card back to full power will depend on the current power and the amount of NFT cashback earned. To recharge the power of any card to 100%, users have to spend an amount of NEXT:

$$
RechargeFee =f(CurPower, ∑NFTCardRewardEarned)
$$