So, today I upgraded to newer version of OS, from Snow Leopard to Lion and I noticed something which atleast to me is new (I have never owned Macbook newer than this which is 2008). Battery has already been charged but the charging led stays red (when using Snow Leopard this didn't happen). When I remove battery the machine enters into sleep mode and I cannot wake it up by pressing power button, only if I insert battery it will wake up. I can't be 100% sure but I think I have remove battery under Snow Leopard also and it did not behave like this. The battery on the other hand is old and has many load cycles (original Apple battery) and charger is also same age (original Apple charger). So is this normal or is my battery and/or charger starting to die? Or is this because of Lion? I already did SMC (or SMU, can't remeber which one it was in Intel machines) reset as well as PRAM reset. Well, I shut down the computer, disconnected the Magsafe charger for a while. Connected it back, no led at all. Powered on the machine, still no led. Disconnected the charger, flipped it and connected again and there was the green led. Well, solved, I guess?