Just about all my batteries are green 25Rs (other than 1 pair of LGs, and an Aspire I just use in my 521 tab) and I've never had an issue. They all came from either MVS to start (a little expensive until I figured it out) and then only from Illum and IMR. For my regulated mod needs a reliable 20A is fine as I never really push them all that hard, and when I need a higher power for a tank, I go to 2 and 3 battery mods rather than pushing a single to its limits.