Yes, Sanyo is subsidiary of Panasonic now.
They can using one brand (like eneloop), two brands using same line of series rather confusing before we get use to it.
Reading around after doing a search it looks like the B “F”’s are just B’s with a new graphite + SiO anode instead of just graphite in the 18650B.
Data sheet seems to indicate that the F is almost exactly the same and may hold a tiny bit higher voltage during discharge at normal temperatures with the difference increasing as the temperature drops. I’ll wait for someone to test these first but it looks like a minor update/tweak.
My Samsung INR18650-29Es from Fastech has been in transit for 78 days. At least I feel reassured knowing that some got their batteries after 5 months. :~
Its a shame that it has come to this with batteries from FT as they had some of the best prices. I have only had one shipment out of 5 get through in about the last eight months and hopefully the one on the water now gets through. Its been six weeks to now so far.
The pair of King Kongs I ordered from FT on the 13th of August arrived this morning,so just over 2 months to Europe. .By sea,Europe is about as far from China as you can get.I did not expect it to get here any quicker.