I now have both SF U2's I bought. The one with serial# A12900 has a rounded body, no flat sides. Now the one with serial# A04279 has two rounded sides and 2 FLAT sides. I was reading in the marketplace that someone wants to buy a flat sided U2 so they can use 18650 batteries. My flat sided one does not have a black sleeve in it, but since it has the flat sides does that mean it can accomodate the rechargeable 18650's? If so then I will use that U2 for the Milky mod. • • Also, do the newer round models have on the U2 clip the round plastic/rubber piece that says "SF" and above it has a rubber square piece I assume to hold the SF round piece in place? Picture below shows what I am talking about. Thanks for the help.
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