IR on the Lii-500 is useless, otherwise a good charger.
Zanflare C4 is very similar to Lii, works as well, and IR works properly.
Opus is good also, costs more, and is somewhat more versatile. IR works about as well as Zanflare, at least I get very similar results. Some people don’t like the fan or the charging algorithm. I don’t have issues with either of those.
Go for the Zanflare, $25 with coupon, available all the time. Don’t bother with group buy for this purchase.
It has quite a few more charging and discharge rates, both lower and higher (200/300/500/700/1000) and charge 2 cells at even higher rates (1500/2000) . If desired it can charge 4 cells faster (200/300/500/700/1000). It can ‘cycle’ cells like NiMh, with a [Discharge Refresh] option. You just set it up and let it go. No need to manually start it over multiple times to accomplish that.
All of these additional abilities can be useful sometimes.