In today’s world of electronic everything, the alkaline battery is always in high demand. But if you’re looking for a more ecological solution to alkaline battery usage, choose the rechargeable version instead of the standard alkaline. Both types of batteries come in AAA, AA, C, D and 9V sizes. Pack sizes vary, so you can buy a few, or stock up for months to come. You’ll also find specialty batteries like button cells, lanterns and alarm clocks.