Unless something has changed recently, the joye / ego batteries aren't true 3.7v and run at 3-3.2v, which includes most clones as well. I don't know about volcano, but I rather get something I know runs at 3.7v.
Riva SE are ture 3.7 and perform noticeably better.
Yeah I see they have SE kits as well for 29.99. If I can't find batteries individually will go this route. Thanks.