Problem with empty battery

since a few weeks I have the problem that in the morning the battery is always weak, if the Essi stands too long (about 14 std) it is not enough to start. new battery I built up three weeks ago, 44ah of atu, brand arctis (had no other there for ford) problem persists, a measurement on the battery with clamped plus pole and meter in between has resulted in zero bulb (ampere). so no normally secret consumer. was also not built in anything that I used in I thought I had checked the car radio again today, see how it will be tomorrow morning. what I have now disconnected is an antenna amplifier, which was really jammed to my opinion, on automatic antenna, because when the ignition is switched off there is no current, as soon as the radio goes out, but sometimes testing 🙂 glove compartment and case au lighting goes out, I checked. a friend of mine is automechanic master and next week we want, if not better the thing If it’s not as cold as it is now at night, it’s better to start, which is clear, the battery is losing more and more power the colder it is. I’m beginning to suspect that the battery may be broken, which is new as I said, but I already have horses in front of the said apoteke………. see. I will try out a loan and install it on Monday, see what I’ll do on Monday. If anyone has suggestions I would be very grateful, as slowly as the ideas go out of what it could be.