I'm so glad I found out about this as an option rather than buying a new shaver. It was easy and fun to switch out the battery and my old shaver works better than it has for a long time. No electronics going into the landfill since I didn't throw away my hold shaver. A LOT cheaper and as i've said, it was fun putting the new battery in. Plus the staff was helpful when I called. This has been a real win.