In my opinion yes, it will help you to callibrate your battery first..

No need to charge up to 8 hours. Charge till it full, the phone will stop charging after that. Go green....

p/s: it is not mention in the manual as well...

To condition a new Li-ion battery, fully charge it; it should be allowed to charge for 7-8 hours on the first, initial charge.

In other words, when you get your new cell phone - and it has a Li-ion battery - allow it to charge for 7-8 hours even if the cell phone claims to be fully charged. (It is preferable to use outlet charger vs car charger or USB charging via computer because of the voltage difference)

After that, there is no reconditioning necessary for Li-ion batteries since they don't suffer from the "memory effect". However, be sure to avoid fully draining/discharging the Li-ion battery as much as possible; every time a Li-ion battery is fully discharged, it loses battery power and life. (That doesn't mean your battery will die if it is ever fully discharged; it means it is best to avoid fully discharging when possible)

Try to recharge Li-ion batteries when they are at 15-25%. Similarly, avoid heat as much as possible and when (if) storing Li-ion batteries, store them not at full charge.

Source: http://dottech.org/tipsntricks/17705/tip-c...on-it-properly/