They arent that good, they weight less then heat/energy engines by 3 kg.
They provide no cooldown/regen.
They provide 50 ish more heat/energy cap only once, but the heat/energy engines provide a cooldown/regen evry turn/shutdown.
They could be usefull in some way, but i find them more then a niche item.
Mixing them up and paired with cooldown/regen boosters, they fall short in an overall stats.
Ex: 2 energy capsules + 2 regen boosters, provide 300 energy cap and 126 regen, with a total weight of 64.
4 energy engines , provide 356 energy cap with 168 regen. For 100 weight…
They are only worth on high weight wepon loadouts, usualy shotgun loadouts, dessolation loadouts.