[header] How to buy rechargeable batteries [title] Find rechargeable batteries that are compatible to the device you have. [step] The type of batteries discussed here will be either aa size or those that fall under the category of lithium-ion. [substeps] Familiar sizes, such as aa, aaa, c and d can be found at almost any store imaginable. 
Concerning cost, rechargeable batteries are a wonderful investment. Rechargeable aa or aaa batteries are known as nickel metal hydride (nimh).