On imrbatteries.com they are having a sale on efest 3500mah 26650 batteries right now @$5 a piece. Not the highest mah, but for someone who needs a 26650 or a few and doesn’t want to spend 10-14$ a piece domestic for them. I just purchased 2 mj1 and 2 hg2 from them and noticed it. This payday I may pick up 4 just to have some spares on hand. I use 26650 tubes occasionally. But prefer to use 26650 batteries instead of the spacers. As of yesterday they still had 300 pieces. Hope this helps someone