The way my a35 battery is draining so quick . Is anyone else going through the same?. And what is causing that and the solution

So my samsung a14 just received the one ui 6.1 update but every time am downloading the update its getting stuck on 69% every time .Ive tried restarting my phone and tried to redownload the update but its keeps getting stuck on 69%.Can anyone please...

I bought a samsung A14 4g and how years of software updates will it get?