Sony Ericsson Xperia X10 Mini/pro :: Battery Not Working?

I now have a problem with my battery. A few hours ago, my battery level was around 35%. A few hours later, it remained at 35% indication. Since this couldn't be correct, i restarted the phone. Now, my battery indication was 100%. False again. I turned the phone off. It wouldn't restart. I tried the 'flash device method' by holding back button and putting in computer USB. No help. I tried SEUS. After that, phone switched back on, with false battery indication back to 100%, which is impossible. I noticed that during all this 'fun stuff', my battery refuses to charge. The LED indicator remains green without flashing, the settings screen doesnt say 'charging'. I know that the phone won't charge below 95% battery. So, the phone thinks the battery is 100%, therefore won't charge, and I'm pretty screwed, especially since I fear that once my battery drops dead, the phone won't be able to charge ever since it will think its 100% full.