Is it possible that there were different battery sizes in the past?

I would like to sell our old DECT telephone and wanted to insert normal, commercially available rechargeable AAA batteries for the buyer, just like the ones we use for our new landline. To my surprise, the batteries were almost impossible to insert. I hadn't even thought about it. Furthermore, there's no pictogram indicating which direction…

AVM Fritzfone?

Hi, I have a large ground-floor apartment. My Fritz!Box is in the utility room. My Fritzfone works near the base station, but as soon as I go into a room further away, the display says "BASIS lost." I thought a simple AVM repeater would be enough? Do I need a separate DECT repeater?