You can't get the V2 E-pack before doing the grove. Check one of the walkthroughs. The place where you get the V2 is locked by a level security requirement that cannot be met until you've done the grove and returned to the master switch in Diego's office.
(I think Easy difficultly might be different - it seems to let you skip some of the progression requirements? In any case, I'm talking about Normal diff.)
Perhaps you're thinking of the V2 shield, which you get much earlier?
e: Also the grove isn't radiation so the V2 does nothing for you, except what the V1 also does. It's not an upgrade vs the grove. V2 adds radiation protection for doing the Reactor core bits.
Yep - you're quite right. The reason I remember the suit having some effect in the Grove is because of exactly what you say - it isn't radiation in there.
So indeed, you do have to try to speed run the Grove, while keeping an eye on energy and health. There's nothing wrong with that of course - except that it fights against our instincts as gamers!
That said, at medium difficulty, I didn't have any issue with this. I used maybe 3 or 4 batteries and a couple of medikits and medical patches to fully explore the level.
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