Check your battery health. By downloading this app.

[yadavmanish]

My Samsung a70 is giving worst battery backup after update. Uh my battery health is also 81 percent. A70 and a50 users try this app and tell ur battery health.  So this would help me to know that where the problem is.

[MrGEEK]

These apps don't provide you original health of battery but an estimated health, on which you don't have to believe.
If its happening after update then perform factory reset, restrict background usage of apps, and charge your phone in a proper manner.

[Anonymous]

yes exactly

[xhdsaif]

**bleep**. this is a third class app don't believe