Recharge NFT cards

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:

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