During an inpatient stay, I had my 12.9” iPad Pro(Model A1652 EMC 2827), which I tried to use much of the time I was awake. The battery was depleted most of the time: I had it plugged into a wall charger, and power was never really more than 5-10%. It lost power frequently. I took it to the Apple Store and was offered immediate replacement.
Now my laptop is in the shop, so I have been working from my iPad, and its apparent charging behavior is similar or worse. Besides that the charge has usually gotten down to 10% and stayed there during the day, an overnight charge while powered off from a wall socket only gets it to around 25%. I get the impression, possibly a false impression, that you ride it too hard and it becomes permanently sapped.
I have read in other posts that iPads need more current than an iPhone, so possibly a different charger would help. Beyond that, what can I do beyond replacing it with an un-sapped model so it will charge from either U.S. or continental Europe power?