These batteries offer brilliant peformance in my MTE M3-2I XM-L Cree LED flashlight (1000 lumen). They charge effectively and their output lasts for ages. I use the torch most evenings to get our cat in from an adjoining field.
I bought these cells to replace two Ultrafire 18650 batteries which, although considerably cheaper, lasted about three or four charging cycles before giving up altogether. I charge these Weiss cells in my Ultrafire WF139 charger which seems to perform ok with the LEDS indicating that charging is complete after 5 hours or so. The LEDs did not previously change colour with the old cells, however long they were left in the charger. Physically, the cells look well made too and come complete with a handy storge box. I also notice that unlike the previous cells these ones do not run hot - the torch remains cool.
These cells come from a reliable stable (Panasonic), have integrated protection circuits and perform very well indeed. On that basis they are unreservedly recommended.