It’s Not going to Ruin the battery life, instead with every update some tweaks are done in order to reduce battery drain issue. Not updating will not only compromise you from security point of view but many apps may not work in optimized way as they would have been with the update.
Forced Android Update
The original post clearly stated that they do not want to updated their OS. They are very happy with the way their device is operating so why is most people telling him to update. If its not broken why fix it in their case.
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Joe King Thank you. Finally someone who gets the point of this post.
Erling Kindly check the 2.5.2 and 2.5.3 threads. You’ll find everyone with alot of ideal drain and less sot. Also I’m happy with my device and software man. Why should I update 
I’m completely satisfied and happy with my device and experience right now.
Louis 
NO battery extremly drain in new update, i must recharge phone 2 3x a day, worst update ever
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Karlositoo Welp 
My phone automatically downloaded it and it is installing it as we speak. RIP Nothing. Thank you for wasting my 45k.
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andrewchris22 lmao byw you can downgrade but it will wipe your data
And also they removed the Lockscreen Name Text font , attaching screenshot before the font was cool.
andrewchris22 There must be a command or script to disable this, but may involve a computer. XDA forum is a good source for information.
a year later
Bump. This is ridiculous. I want to update my phone when I WANT, not when NOTHING wants. In the middle of the phone usage it asks for updates, I reject, and after some time it will FORCE me to update. One year later you still do this. Absolute DISRESPECT.