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Message: <blockquote data-quote="Janx" data-source="post: 5554666" data-attributes="member: 8835">casual researrch I'd done on the 3g indicated Apple would charge about $100.  You could find a company to do it for about $60.The main reason is that by soldering the battery in, they save space.  How much space?  Probably millimeters.  Some folks used the lack of user-changeable battery as a arguing point against the iThing.  Having worked in the tech hardware industry for years, my perspective was that it was a worthwhile trade-off.those millimeters are represented by connector contacts (usually springy), plasitic guides to keep the battery inplace and guide it in, plus extra plastic guides for the cover and a release mechanism.  All of that plastic removed meant the phone could be smaller/fit more hardware in.I recently had a debate with somebody about whether HP's DL360G7 truly had 18 DIMM slots like the spec sheet said it did.  No, way I said.  It's a 1U form-factor box.  The drive bay, CPUs, powersupplies and PCI card tray takes up too much space.  Literally, all the previous models I'd seen only had 4 slots.So we get one in, and I pop the cover, and sure enough, there are 2 banks of 9 slots, one on the left, one on the right.This is a machine that has a set height, width, and depth.  And for 10 years, was constrained by the size of those parts I named.  They got the power supplies to be smaller, the drive bay to use small-form factor drives, and PCI-express cards are smaller too.  This opened up space in the chassis for a meaniningful amount of memory slots.In a small device, millimeters mean a lot.</blockquote>

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