I have this lamp now for about 2 weeks in use. It is not too big and also interferes so not in your pocket. It makes quality a good impression! It is bright enough to see outdoors enough even in complete darkness. Inside, they lit a ca 30 square meters large room bright enough to see everything. She has a blue tinge. At the Haltbarkeeit the Baterie I can not say anything yet. In order to climb to the Baterie four small Phillips screwdriver to open. Thus, a fast exchange is not possible! The key would have to be pushed as long as light is required.