These two Varta Longlife Power 9V batteries are great value for money, lasting just as long, if not longer than alternatives offered by other big-name brands. Manufactured in Germany, these batteries have been produced to the highest of standards, to ensure that you are receiving power that you can rely on. Also known by the size codes PP3 and 6LR61, these single-use batteries are most commonly used in smoke and carbon monoxide detectors, as well as a variety of other medium to high drain devices.