How can I change internal battery on an Eleaf Ikuun i200

How can I change internal battery on an Eleaf Ikuun i200
Hi, I have an Eleaf iKuun i200 vape kit that has an internal battery and I would like the option to be able to change the battery, although, the device has has no way (that I can see) for me to open it up and replace the battery...please advise...kind regards...Bash. gathoobashir@gmail

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