Rapid loss of battery [power

[Camellia]

In the last week my 6 year old Samsung galaxy phone has begun to lose power at an alarming rate.

I am sending a few long texts - no more than 3 per day. I don't stream, use e-mail or anything else like that on it and i am confined to home until July so it's not going anywhere. Usually it will lose about 6-10% a day, now it's more like 90%. Have used the setting maintenance button to close off background apps but that doesn't seem to help. My husband thinks the battery's kaput. help please. 

[Cleoriff]

@Camellia 

Yes a new battery is needed. you can get one from Amazon. What make of Samsung is it  (just to make sure the battery can be removed)?

[MI5]

Have you rebooted the phone recently?

[Camellia]

Hi Cleoriff

It's a Galaxy S6 Edge bought in Sept 2016.

Doesn't appear to have any way of getting into it to remove a battery, but suppose there must be, for the sim card insertion etc.

Usually get all this done in the local O2 shop - now shut because of lockdown.

[MI5 · Accepted solution]

Non removable battery.
Have you rebooted as something may be stuck trying to sync.
Is the top of the phone getting warm?
Have you checked for software updates?