In its current state, Chaos Accelerant is not strong enough to justify it still only having one Fragment slot, especially when other Grenade Aspects (Touch of Flame, Touch of Thunder, and Touch of Winter) can give better bonuses to their respective subclass Grenades without even needing to charge them.
With the loss of the bonus damage in Void 3.0, Chaos Accelerant isn't beneficial to any Void Grenades other than Vortex. There's even a bug with it they causes Scatter Grenades to do less damage than they would uncharged.
It needs to be brought in line with the other Grenade Aspects. Either bring the bonus damage back (even if just partially), or give it another Fragment Slot.
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Honestly, if it keeps the charge up without other changes via other fixes, it should get 3 slots by that virtue. Or remove the charge from non-HHSN nades, buff charged Scatters to not be useless, buff HHSN damage (back to OHK in PvP, IDK how much in PvE) and give it 2 Fragments.