Have only charged these to around 3.83v per cell for storage and have yet to capacity test these cells, but so far I'm impressed. My Revolextrix hobby grade charger was showing internal resistance values as low as 0.4 to 0.6ohms despite only charging at a modest 12 to 15 amps. As I understand it, higher charging currents give even lower IR readings.

Cells arrived with M6 posts already installed and some plastic insulator caps top and bottom. Sides were already covered with black vinyl sticker sheet but of course I had to dress mine up a bit more with some dark blue vinyl wrap. Btw if you're shopping for battery lugs, 1/4" is just slightly larger than M6 and works well. Hope this helps.