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Battery not lasting long? Swap it out (requires soldering).
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Insert a SIM card eject tool or paper clip into the hole next to the headphone jack.
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Press down on the paper clip until the SIM card tray pops out.
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Grasp the SIM card tray and slide it out of the iPhone.
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Insert a metal spudger into the slot between the dock connector and the antenna cover. Gently pry up near the two tabs to create a small gap between the antenna cover and the silver front bezel.
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Insert an iPod opening tool in the gap between the antenna cover and the front bezel. The wedge of the tool should be pointing towards the antenna cover. Slide the tool around the corner and up until you reach the metal backing.
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Repeat the same procedure on the other side of the dock connector.
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Grasp the antenna cover on either side and slide it up and away from the iPhone. This requires some force. If it does not come free, ensure that the antenna cover is lifted up enough to free the catches.
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Remove the three Phillips #00 screws securing the rear panel to the iPhone.
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The small square hole is the location to insert the dental pick in the next step.
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Start removing the rear panel on the side with the buttons.
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Slide the dental pick completely into the square hole. You may need to wiggle the tool and apply a good amount of force to get it to go all the way.
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Pry up the rear panel by pulling the dental pick counterclockwise in a quick motion. Apply force perpendicular to the plane of the display assembly. You may be afraid to go fast, but going slowly is more likely to bend the case.
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Use a spudger to free the rear panel from the iPhone along the corner and top.
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Repeat the same procedure on the other side of the iPhone. Slide the dental pick completely into the square hole. You may need to wiggle the tool and apply a good amount of force to get it to go all the way.
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Pry up the rear panel by pulling the dental pick clockwise in a quick motion. Apply force perpendicular to the plane of the display assembly. You may be afraid to go fast, but going slowly is more likely to bend the case.
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The rear panel is still attached to the iPhone by the headphone jack cable, so don't entirely remove the rear panel from the iPhone just yet.
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Use a spudger to disconnect the headphone jack cable from the logic board.
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Use the tip of a spudger to remove the cloudy white glue covering the battery contacts.
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Working from the edge opposite the battery connectors, insert a spudger between the battery and the plastic frame and pry up. The battery is attached to the casing with an adhesive, but should slowly come free.
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Wait about one minute for the alcohol solution to weaken the adhesive.
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Use the flat end of a spudger to gently lift the battery.
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Clean the solding iron by melting a small amount of solder directly onto the soldering iron's tip and then wiping the tip of the soldering iron on a damp sponge.
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Place the desoldering wick on top of the existing solder ball.
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Place the soldering iron on top of wick above the existing solder ball.
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Hold the soldering iron in place until the solder melts into the wick.
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Repeat the same procedure on the remaining two connectors.
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Lift the old battery out of the iPhone. Be sure that all the solder has been removed before pulling the wires away from the board. The wires should come free with little to no resistance.
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Melt a small solder bead directly onto the metal connector on the board by placing the soldering iron onto the metal connector and then pressing solder against the tip and the board.
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Once a small amount of solder has melted onto the board, lift the solder away first and then the soldering iron.
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Place the wire from the new battery onto the new solder bead.
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Press the tip of the soldering iron onto the solder bead until it melts.
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Slide the wire lead into the liquid solder until it is in the center of the bead, then remove the soldering iron.
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Continue with the other two connections the same way, taking special care not to solder two of the connectors together.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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Where can I source an iPhone 2g battery in 2018?
Click on the button on the top of this page that says, “iPhone Gen 1 Replacement Battery available for sale on eBay”
You should be able to find these items at a Radio Shack if you don't already have them.
Right, I’ll go do that real quick /s
