I CHANGED THE NAME OF THE THREAD! YOU WILL SEE WHY AS IT PROGRESSES!
OK,,,,,,,I have sort of been on a Charger binge. More contemplation than actual purchasing. Although I have Two new ones.
I have gone back and forth with the newer chargers with this so called fancy technology and a few that I already have w/ Two or Three year old technology.I have come to the conclusion that I prefer my slightly older technology to the more recent chargers with more functions.
I had my eyes on the Opus BT-C3100 2.2,Liitokala Engineer Lii-500 and most recently the Xtar Dragon VP4. I submerged myself with as much information as my old brain could absorb! I asked questions, read reviews and measured the pros/cons.
There are several that test Internal resistance, get the capacity by charge/discharge/charge[that sounds time consuming to me!], show the actual charging current[live] and several others.
It got me thinking that for me, simplification is all I need and what works best. Below are the ONLY things I really need/want in a charger:
"THE SIMPLE SEVEN"
1.MUST GIVE A FULL CHARGE-4.20V [NOT MANY CHARGERS SEEM TO DO THAT TODAY].
4.HAVE AT LEAST 2 CHARGE CURRENTS, PREFERABLY 3.
5.HAVE A VOLTAGE DISPLAY ALONG WITH EITHER A CHARGE PERCENTAGE AND/OR A BATTERY W/ BARS INDICATOR!
6.CAN CHARGE A 3400mah 18650 @ 3.60V IN 2.5 HOURS OR LESS!
7.ABLE TO CHARGE MULTIPLE SIZE L.ION AND Ni-MH.
I have about Ten chargers if I go back to the beginning! I use Four or Five of them.
1.EFEST LUC V4 
3.FENIX ARE-C2 
My Fenix ARE-C2 is the "only" One out of those Four that can do "THE SIMPLE SEVEN"!
I do not need to check the Ir and true capacity. I can tell when my batteries are degrading SIMPLY by actual use and using my DMM before charge, after charge and after resting awhile! Once I notice a battery that has a resting voltage of 4.08 to 4.11V then it is time to recycle them or save them for emergencies!
The charger just needs to have the "SIMPLE SEVEN". Charge them, put them in my Modded trail torches and repeat the process with no worries!
If not, I am the kind of guy that would obsess about ALL those tests, keep track of all the batteries and how they fared! In the mean time Poor CAPO would be deprived! He would get fat, I would get fat and that is that!
I will say that out of ALL of my chargers I like the display of the L2 the best.
As you can see it has charge rate/% of charge/voltage/time elapsed and battery progress w/bars! 5 pieces of info in such a small LCD Screen!
If it gave a Full charge[only 4.15/4.16], was a little faster and had Four bays,,it would be my favorite,,,,,I still like the little guy!