There are many different types and brands of rechargeable batteries that you can use, and the best known one would be Duracell rechargeable batteries. You can buy a Duracell charging kit for about twenty pounds, and this will come with some batteries also to get you started. You Can buy the chargers and special adaptors that allow the other sizes of rechargeable batteries to be charged up, as they will not fit the standard size adaptor. The D cell battery chargers will usually cost more to buy, and this is due to the large size of the battery. Duracell rechargeable batteries may seem very expensive to buy at first, but in the long run they will help to save you large amounts of money. You can buy these batteries at a much lower price if you look on line for them, as there are sites like Endurance batteries that specialise in supplying them for the consumer.