Where can I purchase a replacement Li-ion battery for my SteriPEN? Ainsworth Kohler November 08, 2016 11:14 Updated Follow The SteriPEN can only be serviced by a qualified SteriPEN representative. If your SteriPEN needs a replacement part, please contact our technical support team. Replacement charges may apply. Related articles What batteries do SteriPENs take? 18650 Battery My SteriPEN has an internal lithium-ion battery. How should I store it? What can I do if the water is not clear or has particulates in it? Inserting Batteries into the Classic Comments 0 comments Please sign in to leave a comment.