Please, be the one to answer this question;
With your batteries in this state, not being able to charge, does your Mighty function as a plug-in?
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If you are beyond the 2 yr warranty, it's most likely S&B will not do repair for you.
I recently purchased one new, went to the site to register. The approval of the registration took weeks and weeks, I think due to staffing issues at Oakland office.
To answer your first question, if in US,
STORZ & BICKEL leads the vaporization market in innovation with CRAFTY, MIGHTY, PLENTY, VOLCANO and more. Visit the site to learn, buy and get support.
www.storz-bickel.com
@JCat's batteries are a viable option, though you have to weigh the cost. Shipped to US, I think it cost me nearly $120US for a pair (he's in Canada, btw) and that's almost halfway to a new, warrantied Mighty (if you find a sale). My case cracked during the change-over and so the Mighty only went a few more months...
But
please, be the one to answer this question;
With your batteries in this state, not being able to charge, does your Mighty function as a plug-in?