i just recently purchased my MB and okay i'm really a noob at this. does it require like any first time charge or something? i'm not sure if this works the same way as our mobile batteries and stuff. but afterall, they're all batteries. so i did not do a first time charge, and i used it the first time till it nearly went flat and then, charged it as per normal. FULL (100%), then took it out. how long will the battery last after each full charge? 3, 4 hours?