Prepare to be impressed. Here's a great option that is more usable, economic and environmentally friendly.
With billions of batteries thrown away each year, these rechargeable batteries are not only long lasting (up to 500 charge cycles), but also charge in any USB port!
Regular rechargeable batteries are, on average, only used up to 10 times due to the unavailability of a separate charger when needed. USB ports, on the other hand, are readily available by way of laptops, PCs, games consoles, etc.
Available in packs of two (AA size).