u can use upto 3hrs and it take recharge time half hour and s pen has power to capture your photos on single click and rotate camera on double click it can also uses as presentation if u are using penup app on your note 9 you can easily draw anything...
one ui is the best software update samsung ever made if u updated your note 9 or s9 s9+ u get easiest user interface and one hand operation no need to thing about battery life battery backup are almost good in one ui
