I've been using these earphones for the past few days and so far the battery is great, it doesnt drain too quickly. The lags on videos are not too bad. I've watched personal videos i took from my phone's camera and movies/tv series i've transferred to my phone using vlc mediaplayer app (of course after the inital setup of bose truly wireless earphones and installation of couple of updates using bose app) videos and sounds are OK there are no lags. I did try streaming videos from youtube, initally-first couple of mins there's an audio delay visible however as the video progresses that seemed to disappear. so overall i'll rate this product 4/5 stars. When bose updates and able to remove minor audio delays when streaming videos it will deserve 5/5 stars... Sound quality is better than my powerbeats 3. I opted to buy this due to its comfort wingtip design (sports), the hook style slips off my ear. These pair of earphones actually stay and don't fall off your ear and it's comfortable to wear-just make sure you find the right size that suits your ear. I like the idea that bose sells eartips in case we lost one or break one due to wear and tear. I'd recommend this product,at least those using android phones (unsure about iphones however i tried these with my ipad air 2 and the audio delay everyone's talking about is visible when streaming youtube videos). For the record i'm using an android smartphone--htc u11.