HAHA relativley?
The shields start regenerating after 1.(something) seconds and regenerate 80+ per sec.

In 4-6 seconds im at full life again, if not less.

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Im also testing one with 2 cx shield regulators and 2 cx shield energizers and 1 cx shield recharger for 105 shield recharge rate per sec.

(at 450 shields and 240ish armor)

I'm going to disagree a bit with my fellow mercs here. I mean, they are right, it's pretty awesome. But I prefer to have a bit more shield buffer with recharge being my secondary focus.

So I DON'T recommend Energizers. That high could be filled with an extender or a recharger. I go with the regulators. It's in the low and unless you run a kin katt or an armor repper (I stopped running armor reppers when suits got native armor regen) you can get your recharge delay pretty low without sacrificing any hp. For me, I find that using my low to lower delay is way better than using my high.

The only reason I say the above is that sometimes you get caught out without cover or flanked while in cover. That extra bit of HP may keep you alive long enough to get around a corner/behind different cover and start regenning. You are STILL very fast on regen. So I do the above to get a bit more flexibility out of my shield suit.

However, if you are in an area with tons of cover and you aren't likely to get flanked then the above fits by the other mercs are better.