Thank you for your question. To replace the batteries in your Delta Cassidy Touch2O 9997T-DST faucet, you would need to locate the battery box and remove the top (that has the red/black wires connected to it) from it. Then you can replace the batteries. Please see in the Quick Start Guide link, that I have provided below, on pages 33 and 34 of section 5 for pictured directions.
Date published: 2017-09-18