BestinOne, an E Young free shipping, retail site, they have a couple 'wholesale', shipping added sites under different names also, has been selling inexpensive, unbranded IMRs for quite a while. Efest is now their their brand name. Have they actually made any improvements other that the new slick label? Maybe.
For the most part their original IMRs initial loaded voltage was a bit low, but they seemed to hold their voltage over the life of the charge quite well. Often better than the fancy brand.
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