Unprotected, flat top. Ships with factory cardboard boxes. This is the highest capacity 18350 that we have seen, yet can still handle relatively high discharge rates. This is the same cell that was originally rated as 1300mAh, but was subsequently downgraded by the manufacturer.
Manufacturer Cell Specifications:
These cells, like all lithium and IMR cells, should not be discharged below 2.5 volts.