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- CAUTION: Battery repair/modification can be dangerous. Exercise caution when following this guide. DO NOT EXPOSE LITHIUM ION BATTERIES TO WATER OR FLAMES.
All batteries have a lifespan. For example, when a phone's battery capacity is below 80%, the phone's battery life will become very short. It’s necessary to replace the new battery with a new one. For old batteries, simply throwing them away is a waste and can pollute the environment. Batteries are made from a number of materials including acid, lead, nickel, lithium, cadmium, alkaline, mercury, and nickel-metal hydride. When battery disposal is not handled correctly, the battery can leak, potentially contaminating the soil and water, and possibly harming human health. Therefore, REWA will share a way to convert old phone batteries into a power bank, turning trash into treasure.
Terminology: Anode = Positive terminal, Cathode = Negative terminal
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We are using old batteries from the iPhone 7 Plus and iPhone 8 Plus. Peel off the tape on the battery protector off with tweezers.
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Apply tin to the anode and cathode of the battery with a soldering iron at 365°C. Heat to remove the protection board.
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Measure the battery voltage with a multimeter. The voltages of the two batteries we have are 3.66V and 3.76V respectively.
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Anode (Positive terminal)
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Cathode (Negative terminal)
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We are combining a 2900mAh iPhone 7+ battery with a 2675mAh iPhone 8+ battery and turning it into a 5575mAh power bank.
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Apply double-sided tape to the battery and align the anodes and cathodes of the two batteries.
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Solder together the anode and cathode of each battery with a soldering iron at 365°C.
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Measure the voltage with a multimeter. Ensure the voltage is 3.7V.
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Get a red wire and a black wire. Strip each end of both wires to expose the copper wire and apply tin on the copper wire with a soldering iron at 365°C.
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Next, solder the red wire to the anode and the black wire to the cathode.
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Press down the anode and cathode.
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Apply electrical tape, making sure to fully cover the anode and cathode.
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Install the button on the middle frame and the power board.
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Apply tin on the bonding pad of the anode and cathode with a soldering iron at 365°C.
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Anode (Positive terminal)
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Cathode (Negative terminal)
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Solder the anode of the battery to the anode of the power board.
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Solder the cathode of the battery to the cathode of the power board.
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Press the button. For this project, the power bank is 33% full.
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Apply foam to secure the battery.
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Install the middle frame to the housing and put on the bottom plastic cover.
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Connect the phone to the power bank. The phone can be charged.
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Connect the charger to the power bank. The power bank can be charged too.
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If you have extra old batteries, you can increase the capacity of the power bank by combining more old batteries. Give it a try and leave a comment of your results.
If you have extra old batteries, you can increase the capacity of the power bank by combining more old batteries. Give it a try and leave a comment of your results.
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Do the batteries automatically stop charging at full? Like can I add iPhone batteries to the powerbank I already have?
@rewatech Hey, would you mind adding the power bank frame and board you bought as a required part? This guide might not work if people don't know what parts you are using
I think they reused an old power bank and just swapped out the batteries and that this guide can apply to most off-the-shelf power banks
tayola -
I harvested a couple of batteries from old iPhones but I couldn't solder the terminals. The tin kept balling up. Then I realized that they were aluminum! Does anyone have a good method to securely connect them?
