Welcome to the Dell Community @xav_B
I tried finding the posts to verify this before posting but have not found them yet.
I have read that the 56Wh battery will not charge or will not run on battery if it is replacing the 97Wh???
I remember it having to do with an "FHD or UHD" LCD display.
I will continue to search but maybe someone else can add to this???
NOTE: What type LCD display do you have???
Thanks for your reply U2, I did find one success story on reddit, but there was no mention of other specs such as display etc. Mine is the 4K touchscreen one.
> I have read that the 56Wh battery will not charge or will not run on battery if it is replacing the 97Wh???
> I remember it having to do with an "FHD or UHD" LCD display.
I've got a 9550 UHD touch with the smaller battery. I think it should work if the right model for your laptop, check codes. But if not straight from Dell, most "genuines" are fakes, and these batteries seem to get pretty stressed in XPS 15, particularly the smaller ones. If the battery isn't good quality or is deteriorated, the voltage may drop under high power draw, tripping the battery protection circuit.