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Whenever i try to sync a Microsoft Exchange mail account to an iPhone, it seems to constantly search for mail with 3G which crucifies the battery life. I've tried this with a few different phones and exchange accounts for friends & colleagues and it always happens. Anyone know why or how to stop it happening?

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up vote 2 down vote accepted

It is not so much Exchange but more just having the 3G connection on 24x7.

You can try (only speaking from personal use of version 2) going to settings, then one of the top options is "fetch new data" (or along those lines) and try to turn it down slightly so it checks in a lot less frequently.

That being said, I can not say if the 3g connection won't drain the battery if it is just on but not fetching data. - You may want to see if there is any way to disable it / set it to on-demand.

Edit - for reference, I had a Sony Ericsson phone with 3G, the battery lasted around 3-4 days, however if I kept MSN messenger working in the backgruond with 3G on, I was lucky to get ~12 hours.

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true, it's not exchange, if you have an iPhone 3G(s) and want to use all the bells and whistles, get used to charging the battery 2 or 3 times a day, here are some not so serious tips :) – Molly7244 Sep 1 '09 at 14:53
Push notifications, for any iPhone app, are a killer for battery life. I find setting it to an hourly fetch means I can go a day or two without charging. – jwaddell Sep 3 '09 at 1:18

Using PUSH to check for Exchange messages via the iPhone will drain the battery much more quickly than just using FETCH. It also depends on how many Exchange folders you want the actively use PUSH with. Checking three folders was much worse than checking two, and one even better. I reorganized my Exchange Rules to move less important messages to folders other than the Inbox and only PUSH to the Inbox and one other folder. This gives me a good 15 hours worth of iPhone use.

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It doesn't have to be Exchange or a 3G. I have one of the original iPhones, and having it periodically check my mail was killing my battery life. I couldn't get through a whole day.

Currently, it checks when I tell it to, not on its own, and I have no problems with battery life (unless I play Civilization Revolution).

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