The plastic wrapper is part of the battery pack and SHOULD NOT BE REMOVED!
LiPo batteries contain chemicals and should not be exposed - do not puncture or open - dispose of properly - do not use if damaged - they can cause an extremely hot fire that cannot be extinguished using water!
Please do not attempt to charge or use a battery pack with the "wrapper" missing. If you have removed the outer case, please dispose of it the battery properly and replace it.Dispose of LiPo Battery Responsibly
See: Compatible 11.1v battery specs - to purchase a replacement battery
CAUTION: The battery should always be allowed to come to room-temperature before charging. Charging a hot or cold battery might delay charging or damage the battery. For best results, charge the battery at temperatures between 50º and 80ºF (10º-30ºC).
Disclaimer
The advice given above is general in nature and you are responsible for the safety of your batteries. SwiftPaws is not responsible for any direct, indirect, special, or consequential damages and personal injuries, including that to life, and health, resulting from the customer’s application and use of batteries sold by SwiftPaws.com.