I recently exchanged for an new air after my air's fan went all hot and running high. With my first air, I installed flash and clicktoflash (flash blocker). Before I turned my air on, the first thing I was advised to do was to leave it charging for about 10 hours or more. I did about 7 hours (I couldn't wait anymore) When I got my new air, I only did like 3 hours. I also installed flash and the flash blocker, but I seem to get lower battery life. Is this just me or did it really decrease my battery life? edit: with my old air, I also would drain the battery to like 10% then charge it, instead of leaving the charger on. I am also doing this with my new air and I let it run down to 2%. The new and old are both 13" 128gb i5.