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[–] DeliciousOnions 3 points -3 points (+0|-3) ago 

That was my next thought as well. Maybe two or three years?

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[–] ruck_feddit 0 points 4 points (+4|-0) ago 

They're probably 18650's, but I don't know for sure. Typically thousands of cycles with the management features running on site. After a while the total capacity is reduced, but they still work fine.