I found a very interesting handbook by Sony. I found it after taking apart a notebook battery pack containing Sony US18650GR 2200 mah 3.78V batteries.
http://www.sony.com.cn/products/ed/battery/download.pdf
My batteries were about 5 years old and still have over 90% capacity. You can buy them for $5 each at:
http://www.centrix-intl.com/details.asp?productid=6052
These batteries from Centrix are pulled from notebook battery packs, so YMMV. They are not protected.
http://www.sony.com.cn/products/ed/battery/download.pdf
My batteries were about 5 years old and still have over 90% capacity. You can buy them for $5 each at:
http://www.centrix-intl.com/details.asp?productid=6052
These batteries from Centrix are pulled from notebook battery packs, so YMMV. They are not protected.
