I work as a secretary at a desk all day. I do have the ability to get up and move around/stretch as needed, but what I'd really need is to have some heat on my mid/lower back during the bad days. I can't use a heating pad with a cord because we're overloaded as is on electrical...even plugging in the pencil sharpener can blow a fuse. So, I'm looking for a battery-operated heating pad. Did the Google search but there are so many companies and options. Anyone have any recommendations....or warnings....about companies to use/avoid or a specific recommendation for a cordless heating pad? I don't care if it's the type that belts on to me or not, just as long as it's cord-free. Thanks in advance for any thoughts.