Use NiMH batteries for highly draining gadgets
Digital cameras and GPS receivers are highly draining devices. If you use regular rechargeable batteries for them, you will have to recharge them quite often. Hence, it is best to go for Nickel Metal Hydride (NiMH) rechargeable batteries. You can get them as Duracell 9 Volt NiMH batteries from Global Imports, Inc. The major advantage of the product is that even after releasing huge amounts of power that the device requires they work steadily. With time, their strength may become low but they can be recharged and be used for at least 150 times to 500 times. Therefore, you will not have to purchase another set of Duracell 9 Volt soon. As per your one time requirement, you can get two sets from Global Imports, Inc and keep your electronics in running condition at all times. By making batteries like Duracell 9 Volt a part of your life, you will not be contributing to the hazardous landfills.
Single use batteries cannot be ruled out
They are the conventional batteries, which run electronics for a few days or weeks and then, have to be thrown away. These batteries are still preferred by many because of their long shelf life that spans for years. Hence, if you are travelling and buy some extra, you can definitely keep them for later use. Alkaline batteries are the best for regular devices while you could go for lithium ones for powering electronics demanding high voltage. For more information visit here:- http://www.batteriesandbutter.com/DUAA.html