Push Mail was introduced in iPhone 3G and to some it is as indispensable as their right arm.
That’s all very helpful but what good is Push Mail when your battery life dies prematurely
This appears as a part of my iPhone Battery Saving Tips & Tricks article.
Push Mail in iPhone OS 3 and still in iOS4 continues to drain the battery at a far greater rate than when it’s disabled or substituted for a little savvy, clever approach to mail handling on iPhone.
There are two types of Push Notifications on iPhone, one for apps and one for mail.
I’d recommend tweaking both for better battery life but only the mail one is covered here.
If you want to tweak your applications push notifications, have a look at this article, HOWTO: Disable iPhone Push Notifications
This has been carried out and tested on an iPhone 3GS running iOS4.