As mentioned above minimum payments are generally the higher of 2% of the remaining balance or $25. If you have high interest cards, you should be very careful with minimum payments as the interest could be close to, or even higher with some cards, than the minimum payment. It's always good to read your cardholder agreement as the minimum payment is occasionally different.
Also, as mentioned before, paying minimum payments during an introductory APR is dangerous. It can be fine if you earmark money to pay off the entire balance during the last month of the intro APR. If you don't, however, you will be stuck with a large balance at the end of the introductory period at standard CC interest rates which are generally high. Intro APR offers should also be considered carefully as maxing out (or even putting more than 10, 30, or 50 percent of a cards limit in balances) a card can be damaging to one's credit. Even if you are not looking for new credit, you might find AAs on your other accounts that could result in a chain reaction of closed accounts and CLDs. If you have a good overall credit file and if your overall utilization is not crazy high (less than 30%) even with the BT, then going up to 50% on a BT card is probably fine. Don't max out the BT card and don't let your overall utilization across all cards get over 30% or so due to an introductory BT offer. Under 10% on BT card and under 10% overall is ideal, but not always practical when trying to take advantage of a BT. But, if at all possible, try to keep your overall utilization under 30% and your BT card's individual utilization under 50% (lower is better for both).
