If your vehicle is not charging sufficiently, this may be due to various factors that affect charging, namely:
Battery capacity (a larger battery will take longer to reach a full charge)
Outside temperature:
Cold weather can slow down
charging and reduce
energy efficiency
State of charge:
The first stages of charging are the fastest, then the speed slows down to around 80% to preserve the battery's lifespan as well as the maximum current of your cable (20 A or 32 A)