Jeff,
ActivPens have a 1 year warranty. If they were purchased within the last 12 months, we'll be glad to replace them under warranty. Please contact Technical Support via the web form on the knowledge base at www.prometheankb.com, select your region/language, Interactive Tools, Contact Us. In the Existing case field input case number: 238243, provide the shipping address and an invoice from the purchase of the pens.
Thanks!