Update battery segment docstring
Update battery segment docstring

QuLogic/powerline,xxxhycl2010/powerline,cyrixhero/powerline,Luffin/powerline,areteix/powerline,bezhermoso/powerline,EricSB/powerline,lukw00/powerline,dragon788/powerline,EricSB/powerline,areteix/powerline,lukw00/powerline,kenrachynski/powerline,S0lll0s/powerline,IvanAli/powerline,dragon788/powerline,S0lll0s/powerline,IvanAli/powerline,seanfisk/powerline,areteix/powerline,DoctorJellyface/powerline,prvnkumar/powerline,blindFS/powerline,xxxhycl2010/powerline,blindFS/powerline,seanfisk/powerline,Luffin/powerline,russellb/powerline,junix/powerline,cyrixhero/powerline,QuLogic/powerline,EricSB/powerline,russellb/powerline,darac/powerline,kenrachynski/powerline,seanfisk/powerline,lukw00/powerline,xxxhycl2010/powerline,cyrixhero/powerline,dragon788/powerline,prvnkumar/powerline,bezhermoso/powerline,Luffin/powerline,bezhermoso/powerline,junix/powerline,QuLogic/powerline,DoctorJellyface/powerline,prvnkumar/powerline,darac/powerline,junix/powerline,IvanAli/powerline,DoctorJellyface/powerline,S0lll0s/powerline,darac/powerline,kenrachynski/powerline,russellb/powerline,blindFS/powerline