regardless what u think bout seidio or mugen...i have the 3500 mAh seidio.. and personally love it.. have everything turned on all day.. gps. brightness all the way up etc.. and use the heck outta my hero. and it lasts all freaking day.. that 2600 mAh might not last for me.. etc.. You get what u pay for.. and while i do believe the seidio is too high..I have no complaints what so ever..
your hero must look like a brick/paperweight now. i have a slim 2000mAh and it lasts me all day and through the night.