Please refer to your system manual (can be found on the product page for each product) for general battery maintenance and use instruction. If your battery has retired and needs to be replaced, please review our videos on at-home battery replacement, or call our technical support at (800) 262-4671 Ext. 782. We find that simply purchasing replacement batteries and following the instruction in our specialized videos is often the easiest choice for our customers. Go to anchoraudioparts.com to find replacement parts and batteries. To learn more about battery maintenance check out our battery replacement videos.