HTC m9 Marshmallow update

[AC Question]

My HTC m9 battery dies quickly with very little use. I tried to manually update to Marshmallow and it won't update. Is it even worth it as far as battery usage saving?

 

[belodion]

I don't know that it would make much difference. What is the main cause of your battery drain, as indicated by your battery usage stats? What is your signal strength? Also, what do you mean by 'quickly'?

https://forums.androidcentral.com/showthread.php?t=409154