Fix battery status on K3.
Fix battery status on K3.

Will probably be more complex on older devices, where, AFAICT,
gasgauge-info is bitbanging over i2c...

koreader/koreader,Frenzie/koreader,NiLuJe/koreader,houqp/koreader,poire-z/koreader,pazos/koreader,chihyang/koreader,apletnev/koreader,lgeek/koreader,poire-z/koreader,mihailim/koreader,Markismus/koreader,Hzj-jie/koreader,frankyifei/koreader,NickSavage/koreader,mwoz123/koreader,NiLuJe/koreader,ashhher3/koreader,Frenzie/koreader,robert00s/koreader,koreader/koreader