While it may seem cheaper to buy a standard pack of alkaline (AA, AAA, C, D or 9-volt) batteries, making the switch to rechargeable batteries can actually cut down on your spending over time. Despite the initial $40 price tag (for a typical charger and batteries), rechargeable batteries can last up to 1,000 charges (longer if stored in the fridge), saving you about $80 a year, on average.