Can you recommend me a charger that chargers li-ion, lifep04, and nimh that has a refresh/discharge feature? 2 slots, inexpensive.
I already have a Nitecore i2.
Have some old li-ions and eneloops I want to refresh.
Thanks.
I’m also interested in a decent, low-cost charger as described by the OP, except I’d rather have 4 slots. 
I believe Gearbest through Fin’s coupon code has the Liitokala has a 2 slot charger for $5.99. I have the 4 slot and it has been perfect. Very happy with it. Mine came with the wall and car adapter plug. I got it because my nitecore charger over heated and stopped working.
Good luck
BLF topic but must click on charger pic through BLF for discount, Member is Fin17, coupon post date 10/4/18, item is Liitokala Lii-202: GearBEST's Sale . Rovyvon A5 $15.99 . Convoy S21 $15.99
Code is still working $5.99: https://www.gearbest.com/chargers/pp_424662.html?lkid=10940189
Not sure if it covers all the specs you want, but check it out.
I have the Liitokala Lii-500 and it has been great.
The almighty Miboxer C4 has 4 slots, but I think it only handles non-Li cells in slot 4.
I’ve been considering this one. Just haven’t pulled the trigger yet.
https://www.amazon.com/Opus-BT-Intelligent-Compatible-Batteries/dp/B01852TBOU
Liitokala Lii-202 refresh and charges lifep04?
Does it work with LiFePO4 cells? It doesn’t say in the listing. Only Li-Ion, Ni-Cad, and NiMH are listed.
Same question as above. LiFePO4?
Clicked on Fin pictures, no discount.
Mine has been excellent, over 2.5yrs(cant even remember how many years total) at least. Plugged in 24/7, been used daily for years until recently. Only down to having a c4-12 sat next to it. I still use the opus for nimhs, also when i am charging more than 4 cells(over spill from the c4-12).
I have already opened up the miboxer c4-12 as a bay spring snapped, so had to repair that the other day.
Back to the opus bt c3100 v2.2, lots of charge current options from 0.2a to 2a on bays 1 and 4. All 4 bays in use limits to 1a each. I have found it to be reliable, flexible and good value. 
Inside is a switch(i have mine opened up on the back of the charger) and a 3.7/ 4.35/ 4.2v switch can be used. I only use the 4.35(sanyo 16650 cells) and of course the 4.2v for my li ions.
It aint pretty haha
Not sure. $6
I found out it charges lifep04. Look at the picture, next to the battery LED icon, second one down, it states it.
Not sure about refresh mode tho.
Yea, I looked at Gearbest after your last post and I had 2 of those chargers in my cart, says OUT OF STOCK.
That forum of Fin17’s for Gearbest deals is the one to watch.
AliExpress has several stores offering the Opus BT 3100 V2.2 for about $29.50. But you'll have to wait 2- 3 weeks for delivery.
Monsieur Lightbringer, don't you own this charger?
Yeah. Nice, but gets heat-stroke easily and the fan buzzes like an angry bumblebee if you use too much current.
I usually have to stand it on-end to let hot air waft upwards, helping it along, vs having to suck it out sideways.
My fan was noisy out of the box, very noisy in fact. I bought a couple of spares from gearbest(not much over a $1 iirc………….cheap!). Swapped it out and its been quiet ever since(24+ months)
I wonder why Opus uses crappy fans in the first place?
Guess all down to cost, cheap components= more profit.
Ironically, the cheap fan inside was replaced with another cheap fan of which is quiet . Maybe luck of the draw as they are very cheap. Other than that(not really a major issue as i put up with it for a year), its been faultless.
I usually or have recommended the opus several times of past, for around $30 its hard to beat imo.
Liking the c4-12, like just being able to place cells in the bays without pressing any buttons. Also the auto charge setting it chooses , seems to be spot on. Other than one of the springs snapping(again cheap components), its been very good so far. I have the c4-12 and 3100 v2.2 sat next to each other for most of my down stairs charging.