My 505 is about 11 months old. I've not been using it at all for the last month or two and when I started it up a couple of days ago, I found the battery is now going flat (to where the system stalls and gives a low battery warning) in just a couple of hours. I have the Sony 110v charger and it will recharge the battery in the two hours or so it says it takes (red light goes out, full 4 bars) but it then goes back to flat in just a few hours. That is whether I am using it or it's just sitting or even when it is turned off.
I checked the Sony site and it says to send it through the charge/discharge cycle a few times and it might improve. I'm doing that now, but I also ordered a new battery a few minutes ago from BatteryShip.com. Being a holiday weekend, that probably won't get here until late next week. If the charge/discharge works I'll just hold onto the new battery but if it is still acting up, I guess I'll switch it out for the new one. It is disappointing to find that the battery didn't last longer than 11 months.
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