S8 battery issues

[Android Central Question]

Battery life suddenly reduced. 18 month old phone. Cant replace battery, so what are we supposed to do?

 

[littlemissImperfect]

Did you install any new app or update recently? Go to battery->usage and see what eats your battery, maybe it gives you a hint

 

[stuckingoo]

DL Accubattery. It has a battery health measure along with other useful info. After a year I'm at 89%. Supposedly.