Check out this seriously innovative Kickstarter project. Lightors are AA rechargeable batteries and AAA rechargeable batteries that can be recharged on USB ports using a MicroUSB cable. They can also be charged on traditional battery chargers. Although they cost slightly more than the average battery, Lightors can be recharged over 500 times and reused so you will definitely be saving money on batteries in the long run. Know someone that always uses batteries, then these rechargeable batteries are the perfect gift under $10 for them!