Free Batteries at Staples December 21, 2009 * This offer has ended. Buy a 20 pack of Duracell batteries for $12.99 and receive $12.99 back in Staples Rewards. Limit 2 per customer per week. Offer good through 12/26/09. Click here to enroll in Staples Rewards. Related Posts: Free Hearing Aid Instrument Batteries Free Energizer Hearing Aid Battery Sample Thanks JC!