Battery works, but is slightly richer than the original
High Battery 10.8V / 11.1V 6600mAh for Sony Vaio VGP-BPS-21 replaces VGP-BPS-21B VGP-BPL-13A VGP-BPL-13 / S VGP-BPS-21 VGP-BPS-21A VGP-BPS 1321b VGP-BPS-13B VGP-BPS-13Q VGP-BPS-13-A with no driver CD (Electronics) 4
High Battery 10.8V / 11.1V 6600mAh for Sony Vaio VGP-BPS-21 replaces VGP-BPS-21B VGP-BPL-13A VGP-BPL-13 / S VGP-BPS-21 VGP-BPS-21A VGP-BPS 1321b VGP-BPS-13B VGP-BPS-13Q VGP-BPS-13-A with no driver CD (Electronics)
The replacement battery is working and has a higher capacity than the original part. He is also for thicker, heavier, and the computer is thereby somewhat steeper. But overall, this is no problem. Unfortunately, the purchase was unnecessary, because the error message under the new Win 8.1 is simply a system bug and does not disappear with the new battery. One must here msconfig / service / call and disable the Startup tab, the program "ISBMgr". Had I known that I would have been up 40 euros can save. It's annoying, but the battery maker was happy about it. Well ...