The DNA200 is using Li-Po cells and to a lesser degree (at this time) 18650 batteries in series. Battery Safety matters thus this post copied from Evolv's forum is laid in this thread FYI:
http://evolvapor.forumchitchat.com/post/battery-safety-7776511?pid=1289707021
And I quote:
I think Evolv places importance on battery safety in the design of their products.
Having used Li-Po batteries for many years with the Darwin, DNA 20,25,30, and 40 I feel the need to pass on a bit of information.
Over the years I have only had 2 batteries cause me some concern. Li-Po batteries can start swelling when they start to fail. I noticed this with 2 batteries that were reaching the end of their duty cycle. Monitoring and checking the batteries should be routine and a part of one's vaping experience. Simply replacing the battery can prevent much greater and less desirable events from occurring.
I only post this as a Public Service Announcement and hope that battery safety and monitoring is given the respect it is due by us consumers.
I post this link to give an example (not to promote fear) as it may give us pause to think a bit deeper about battery safety.
http://www.orlandosentinel.com/news/breaking-news/os-ap-e-cigarette-explodes-20151028-story.html
To the device makers:
I ask that you consider designing a safety feature into your devices that can monitor the battery for swelling and alert the user before more destructive events can occur, and/or make the devices more readily available for battery replacement when a fault (swelling) is seen or battery replacement is desired by the end user.
God Bless and be safe.
http://evolvapor.forumchitchat.com/post/battery-safety-7776511?pid=1289707021
And I quote:
I think Evolv places importance on battery safety in the design of their products.
Having used Li-Po batteries for many years with the Darwin, DNA 20,25,30, and 40 I feel the need to pass on a bit of information.
Over the years I have only had 2 batteries cause me some concern. Li-Po batteries can start swelling when they start to fail. I noticed this with 2 batteries that were reaching the end of their duty cycle. Monitoring and checking the batteries should be routine and a part of one's vaping experience. Simply replacing the battery can prevent much greater and less desirable events from occurring.
I only post this as a Public Service Announcement and hope that battery safety and monitoring is given the respect it is due by us consumers.
I post this link to give an example (not to promote fear) as it may give us pause to think a bit deeper about battery safety.
http://www.orlandosentinel.com/news/breaking-news/os-ap-e-cigarette-explodes-20151028-story.html
To the device makers:
I ask that you consider designing a safety feature into your devices that can monitor the battery for swelling and alert the user before more destructive events can occur, and/or make the devices more readily available for battery replacement when a fault (swelling) is seen or battery replacement is desired by the end user.
God Bless and be safe.