Hey guys, I have done some statistics of my Roccat Pyra Wireless mouse regarding on the battery life. Below are the recorded time frame:

15.15 - 16.26 (1 hour 11 min)
20.38 - 1.07 (4 hours 29 min)
9.15 - 14.18 (5 hours 3 min)
Total = 10 hours 43 min

Recharge period:
14.18 - 16.48 (2 hours 30 min)

P/S: The usage of the mouse is merely on surfing the internet and it includes standby time.

The purpose of buying Energizer or Duracell batteries is to test out my Roccat Pyra Wireless mouse for the 2nd attempt as the default GP rechargeable batteries are not good enough IMHO. Thus, I want to do some small experiment by using other brands batteries. Anyway, I just bought myself Durecell Plus batteries and now trying it out for my Roccat Pyra Wireless. Wait for my good news. 

tested the pyra wireless...

pro.

1. small
2. extra button using the "shift" feature
3. virtually lag free...leave it inactivity for some time then try to use it

cons.

1. cannot connect the cable and become wired mode like razer orochi
2. laser technology is still not like MS bluetrack..can use on any surface..
3. size..can be a double edge sword..to me it is too small..like any other wireless portable mouse..