The 120-watt charger is getting slower to charge to the back because it has a battery protection measure in it. In general, the charger is the fastest when it is charged from 0 to 80%. But after 80%, he has to roll the mattress, which can effectively fully charge the battery to eat and keep the battery from bursting. This is also to effectively protect the battery.
120w charger charging more slowly means that the battery life has not been