I have both the black, 3 of them (new UI) sp10a and 1 blue sp10b. They all work with Efest IMR 14500 650 mah (purple) flat tops and button tops. They also work with AA. The also all work with Sanyo ur14500p flat top.
.
Opps, I forgot to mention that They all work with rebranded Duracell (made in japan) Eneloop’s and Tenergy LSD 2300mah.