Exxact Parts Solution SONY compatible 9-Cell 11.1V 7800mAh High Capacity Generic Replacement Laptop Battery for VGP-BPL13,VGP-BPL21,VGP-BPS13,VGP-BPS13/B,VGP-BPS13/Q

ok

Fit and worked perfect. Lasts at least 4 to 5 hours on a charge.

AVOID. My original 6-cell battery usually lasts about 2 hours... I bought this 9 cell expecting it to last closer to 3. Upon receiving it, fully charged it, then unplugged it and let the computer sit on battery power. First cycle was 1 hr 40 minutes. Charged it overnight and used my laptop the next day on battery power for a whopping 1 hr 30 minutes. What's worse is that the computer completely shuts off without warning when it says 40 minutes remaining. It obvious that this battery is either old or has defective cells considering it lasts 50% as long as it should and drops off suddenly. You can buy the individual 18650 Li-Ion cells for about 8-12 dollars each, which makes rebuilding a battery yourself quite costly. I gambled and tried a 9 cell on amazon for under 40 dollars shipped because it seemed like a screaming deal, but I guess this is an example of the old addage "you get what you pay for." Hopefully if you are reading this you won't make the same mistake.

Great price and works well. I've used this for a month with no issues.

Perfect fit and is very long lasting.

Good product