Yes, but observe battery safety and basic common
sense.
NOTE: Battery Safety
Use special caution when working with Li-ion cells, they are very sensitive to charging characteristics and may explode or burn if mishandled.
Make sure the user has enough knowledge of Li-Ion rechargeable
batteries in charging, discharging and assembly before use.
Always charge in/on a fire-proof surface.
Never leave charging
batteries unattended.
Never continue to use an e-cigarette if you can feel the battery get hot. If your battery gets hot to the touch, or if it begins smelling: DO NOT USE IT ANYMORE. Let it cool down (1 hour) in a safe environment (outside preferably), and dispose of correctly, or make arrangements to return, if still under warranty.
If your e-cigarette or device begins activating itself, immediately remove your atomiser and disconnect the battery. Do NOT trust the battery, nor the atomiser anymore from this point on. This means never leave either of the components connected in your pocket, in your nightstand, or out of visibility where you can not immediately separate the two components.
Read the information found at:
Battery University before purchasing. It is important to carry batteries properly, charge properly, and dispose of properly.