Is there a maximum voltage limit for iPhones?

I'm creating a charger for iPhones and Samsung/Android phones. I was wondering if these devices had resistors, so that I can't blow peoples phones.

There's a maximum voltage limit for everything. Since they have USB connections, they are expecting to see 5 volts. It may be able to regulate a bit, but I would keep it within a couple of volts.

The iphone will not draw more then what is needed.

No i don't think there's to say the least.

Read the USB specifications (or any abstract, e.g. At Wikipedia). There are some rather stringent voltage limits, depending on which USB version we're talking about.
Also, there are some (lower) limits on the current that has to supplied at these voltages - if your device can't provide that current, the phone may refuse to charge at all.

And yes, 4 1.5 V batteries will exceed the USB specifications. 3 AA batteries will have too little voltage, except when straight out of the box. You won't be able to get around that wtihout some form of voltage regulator.

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