Unfortunately, Varta is right on average. Although I have the batteries bicht get as packed in the photo, but as a bag with 4 batteries, but PD0614 and ED0624 glad indeed that I was still lying in the first 6 months after manufacture !!!
On average, a battery per four-pack is used. Here I ask myself honestly what place the manufacturer for quality control of the day. Within a welded-in 4-pack I actually expect the same quality.
You should actually provide 8 networked wireless smoke detector in the long term with current. If I install these parts, makes every week another device false alarm ... a lot of fun with it.
Does anyone know a reliable way batteries available to buy? With me sammlet only nch hazardous waste!