VAIO Z 長達1個多月的電池測試結果

Since I am an idiot in Chinese Word typing, please allow me to use English.
Many of us are complaining the VAIO Z/SR battery will drop from 100% charge to 95%, 90% quickly. It also happen to my Z90, I have tried to call the Japan SONY VAIO Customer Service and they say “It is a normal case the battery will drop from 100% to 80% quickly which caused by the protection unit inside the battery.” It doesn’t make any sense to me. So I borrowed a Z16GN (HK) and Z17GN (HK) from my friends.
The test is simple I charge all battery for 6 hours and leave the battery inside the notebook for different time period (1 days, 2 days, 5 days and 1 month)
Sep 11 to 12 1 Day
Z90 95%
Z16GN (HK) 92%
Z17GN (HK) 91%

Sep 12 to 14 2 Days
Z90 83%
Z16GN (HK) 85%
Z17GN (HK) 82%

Sep 14 to 19 5 Day
Z90 80%
Z16GN (HK) 80%
Z17GN (HK) 80%

Sep 19 to Oct 19 1 Month
Z90 80%
Z16GN (HK) 80%
Z17GN (HK) 77%

The above testing show that the battery will drop from 100% to 80% within first 2 days very quick and hold at 80 % for long time. I don’t know how to stop it but I am pretty sure that it is not control by the battery protection from the VAIO control center because I have try to charge the battery to 100% and un-plug the battery for few days it also drop to 8X%.

But the Japan VAIO Customer Service told me that the SONY HK VAIO quality most near to Japan VAIO in the worldwide. Japan and Hong Kong share the same product line, USA and Europe use one and China & Taiwan & other counter use one.