No, these aren\'t some sort of weird, AA battery, this is actually a 18650 Lithium Ion Cell. These round high capacity cells have been mainly used in flashlight type applications but with its capability to be used as a drop-in rechargable cell at 3.7V with a capacity of 2600mAh. This is a great battery option for those of you who need a simple to install and replace cell with a lot of juice. These 18650 Cells have a standard discharge current of 0.2C to a maximum of 1C and can handle about 300 charge cycles. **Note:** This battery is not available to ship to Alaska or Hawaii, or through any express services (2-day, overnight), or internationally. This is temporary! Check out our [blog post](https://www.sparkfun.com/news/2248) for more information. Additionally orders may take longer to process and therefore do not qualify for [same-day shipping](https://www.sparkfun.com/support#Same-DayShipping). Sorry for any inconvenience this may cause! **Note:** This item is non-returnable. If this item arrives damaged or is not functioning properly, please do not hesitate to contact us to see if further actions may be taken. **Features:** * 65mm x 18.2mm (2.6\" x 0.7\") **Documents:** * [Datasheet](https://cdn.sparkfun.com/datasheets/Prototyping/ICR18650%202600mAH%20datasheet.pdf) * [Product Video](https://www.sparkfun.com/videos#all/2dpN1n73_AU/115)