I have two Opus BT-C3100, two LiitoKala - Lii500, 1 Lii400 and a Nitecore D4, and all is good chargers. The Opus charger can charge two batteries @ 2A, or 4 x @ 1A. Lii500 can charge max 4 x @ 1A.
The Nitecore D4 is a good charger, but a slow charger, only 350mAh if you charge 4 x batteries. 750 if you charge two.
So is there any charger that can:
a) Charge 4 x 2A and/or b) Replace my Nitecore D4, with a charger that can charge 4 x 1A at least.
Ive probably tried them all. IMO, this still remains the best of the 4 station 4 amp budget chargers. I have 5 of these as my main charging bank for 18650-32650 cells. After dozens of cycles, all stations still terminate consistently within .01V of each other. Highly recommended by HKJ for the quality of charge.
Also take note that many cheap chargers can be harsh on cells and will diminish their capacity and service life. Compare the details of his review for this charger to all others before you buy.