Yes, I've just tested a few of them. I've also found a proper charger for them as well.
I've found that my Photon (with a transplanted 35K white LED) works great with a single 2032-3.7V instead of the two regular 2016s. Also, the 35K LED is not overdriven and
stays at its full new condition brightness. Intensity is also impressive because of very little voltage slump under load from Li-Ion. :thumbsup:
I was thinking of posting a feeler on CPF for a group buy, because the single price per cell is $5. U.S.
But if I order a minimum of 100 pieces, the price comes way down to around $1.50 each.
-not bad at all for a cell that will recharge fully for 300-400 times.