Unprotected, flat top.  Ships with factory cardboard boxes.

This is widely regarded as the best high drain 10440 battery in production today.  Great for those little pocket rockets!

Diameter:10.3mm
Height: 44.1mm

Manufacturer Cell Specifications:

• Capacity: 350mAh
• Charging Voltage: 4.2v
• Maximum Charge Current: 300mA (150mA or lower is best for cell longevity)
• Recommended Discharge Termination: 2.75v

These cells, like all lithium and IMR cells, should not be discharged below 2.5 volts.

You can read HKJ's excellent review of this cell here.

A few discharge curves of this cell from HKJ's comparator.  Notice how it handles up to a 3A discharge and how it destroys the Ultrafire 10440.