A second life for our batteries
Patients undergoing heart surgery receive an external pacemaker for initial 24 hours to ensure proper heart rhythm. These devices are powered by AA batteries and are replaced for every operation. But, what happens to batteries that are only used for a day?
Often these batteries are still at 90% capacity, so it is a waste to throw them away. The batteries are tested and, if they are still fine, they are used in the saturation monitors (which measure blood oxygen levels). Every week, we give around 40 AA batteries a second life.