Battery draining very suddenly.

[PaulF]

Having issues with Xperia XA1. Battery can be normal but will then suddenly start to drain rapidly for no reason - not using/no apps running etc. It can go from being fully charged at 6pm to being flat at 8.30pm. The battery level and estimated battery time showed that the phones was fine for over an hour, but then suddenly drained from 100% to 0 in 30 minutes despite nothing running and in my pocket. 

[Maicol00]

Tengo Problemas cn la carga... No retieme carga.. Ya se le cambio la bateria y sige la misma falla.. Segun el tecnico me dise q es  targeta analigica? Esto fue a raiz de una actualización de software... Neseciro solucion.. No me manden al foro!!!! 

I have problems with the load ... Do not remove the load .. The battery has already been changed and the same fault continues .. According to the technician I designed what is an analog card? This was in the wake of a software update ... I need solution .. Don't send me to the forum !!!!

gt