Hello, there are two different modes - even HD 25 minutes of recording approximately 4GB Speicher.Hatte I just tried, and the camera has approximately 50 minutes added to the HD mode. So when the memory was full, the camera went out. Had just arrived a 8 GB memory of my other Cam.Zuhause I had another SD memory used and the Cam was still 20 minutes. 70 minutes recording in HD. The size of the Cam is impressive. This is really small. In the description of a battery is mentioned but not there. In the device a Accu is integrated and can be recharged with me on a 5 volt charger on electricity. The charging unit is still out of my old Somikon and but works great. So there is no battery that you simply interchanges so. If empty then tinker with the current or even what. 5 stars because I am pleasantly surprised. The LO mode I had not tried, but I'm sure the more GB to 8 disks more it fits. Have Fun