EbergIt's all relative, take a look at our product page, and check the "Battery Info" tab. This is primarily used for brief on/off cycles, and not intended for long 10-minute sessions. Although the batteries are very common and inexpensive, they are very small and this light should not be used in place of a more competent light for high output/long session use.
https://www.tecaccessories.com/products/pixel-ti-keychain-flashlight