You won't be able to safely use the full 220 watts with any two batteries on the market.
Calculate the minimum and maximum amp usage based on the battery charge, and make sure the two married batteries you choose are capable of these values. You can exceed these wattages but you will prematurely age the batteries and possibly have an accident. Married batteries are two or more cells that are bought together, used and charged together.
2 x 20 amp CDR = 120 watts max
2 x 30 amp CDR = 180 watts max
You can model these values using steam-engine based on a maximum battery charge of 4.2 volts and a minimum where the mod will usually cutoff around 3.2/4 volts. Make sure you are looking at the 'battery' box on the right, not the 'atomizer' box on the left.