Hi! Just got my baby last week and I'm getting the hang of it...except the check battery... It starts to flash red slowly and that means it's dying right? When do you switch it out to a fresh battery? Drain it till it's flashing fast or before hand when it's flashing slow? And what the heck are the numbers popping up when you click check battery? I've seen it go down to 2.0 but it's also started to die around 3.5. ^^;; help?