Right. I've been told that Abbott's premium XR does not need to be recharged. I've been told they have two models, the larger battery lasts for 7 years and a slightly smaller last for 5 years. I'm told they are guarenteed for 5 years and they make it sound simple to change the battery after it dies. I spoke to a nurse yesterday who had one put in about a year and a half ago. She had chronic pain in her foot and leg from 2 prior surgeries and then a car accident. and she got about 90% pain relief. No charging. She would recommend the Abbott.