Replacing the battery on an iPhone 3G?

Question

iPhone

Good afternoon.
Recently, the battery on my iPhone 3g (3.7 V 1150 mA h) has become too fast, and accordingly I wanted to replace it. On the Internet I found a lot of ads for the sale of new batteries. Since I have to replace it, I would like, if possible, to install a more powerful battery, for example, from 3GS (3.7 V 1219 mA h)
Will such a replacement harm the device itself and what points should I pay attention to when choosing a battery?

Answer 1

I bought a battery for iphone 3G on ebay for 5 bucks. Rearranged. It is an order of magnitude worse than even a half-killed native battery. Chinese in the worst possible way. :(((Do not be stingy, buy more expensive and better.
And yet ... changing it to 3G is really gemorno. I collected and disassembled my iPhone 3 times. Either the camera did not work, then the speaker. The loops seemed to have been inserted, but they did not contact.

Answer 2

If you want more roomy, then you can take 1600mAh on ebay, the price is very low.
Example: -Link-

Answer 3

A lot of attention should be paid to the CORRECT sequence of disassembling the device. at the slightest mistake, you will break the cable, and of a high-quality battery.
Here is a detailed manual in pictures - Installing iPhone 3GS Battery