I've been reading up on whether this is worth the risk and i'm not so sure so i'm here asking now. Yesterday i read of a guy who got a brand spanking new iPhone 6S, it had iOS 12.0, s/he updated to 12.1.1 and it just killed the battery big time. As i'm reading through threads i'm getting people going from 100% to 0% in 5 seconds flat (ok, exaggeration) but from the responses that follow it seems they updated yesterday kind of thing and that over a few days & charge cycles this should sort itself out. Whether it did or not who knows because people don't come back and update once their problem has been resolved. I'm not a big fan of the look of iOS 11 & 12 which is why i stayed on 10.3.1 but as i just got a new battery yesterday as i plan on being an iPhone owner for at least another 2 years now then i'm going to have to accept that i may need to make the jump as more and more apps require higher & higher iOS versions to work, including my banking app. So for those who stuck it out, does the battery life drop off massively in the opening days but then is no different or even better after a few charge cycles? Currently i can start the day with 100% at 6am and with my kind of usage - bit of browsing in the morning, on my breaks at work for a combined 1hour then by 6:00pm as i finish work i can sit at anything between 20% (if i've been playing games) and 50%.