Since i've got the same batteries, I've been checking this out a bit more. It seems you're not the only person who's had problems with the BP71. Google groups will show you more. However, with the internet being what it is, two people with bad batteries can make problems seem a lot worse...

According to this page, you have a couple options for replacing it:
In reply to:


What other batteries are available?

There are 4 batteries that I know of for the FX210/FX215 laptops. Three of these are from Sony, the fourth battery is from APC. These batteries will also work with the FXA and European AMD based machines. I believe that they will also work with any FX series Sony Vaio.

PCGA-BP1N -- 1700mAh, Original battery, about 45 minutes of life without PowerNow! and original bios. 70-80 minutes with PowerNow! and updated bios.
PCGA-BP71 -- 2600mAh, Extra Battery, about 90 minutes of life without PowerNow! and original bios. 120-140 minutes with PowerNow! and updated bios.
PCGA-BP71A -- 3000mAh, Extra Battery, unknown haven't tested.

LBCSY1 -- 3200mAh (was listed as 5000mAh), Battery from APC.



From a quick search, the APC one looks like a good dea, and would be a name brand one from people who've made their name making batteries. I got my BP71 used, and it's worked flawlessly for almost a year now. I leave it plugged in most of the time, probably running the batteries down once a week, and it does fine.

Matthew