Thank you for reaching out to the Samsung community! We would like to inform you that the S pen battery status can be check by the S pen icon shown on the status bar. Once you detach the S pen the icon will be available and black filling in it shows the charge. When the S pen is discharge completely the icon colour will change to gray.
Be sure to hit ♡ when you find an answer that works for you. For further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
