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Reuse Old Batteries As A Power Bank

Introducción

  • 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

Qué necesitas

Resumen del Video

  1. Reuse Old Batteries As A Power Bank, Remove the protection board: paso 1, imagen 1 de 2 Reuse Old Batteries As A Power Bank, Remove the protection board: paso 1, imagen 2 de 2

    • CAUTION: Before starting this guide, make sure that the batteries are fully drained (0%)

    • 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.

    • Please use non-conductive tweezers to avoid short-circuiting the battery.

    • Apply tin to the anode and cathode of the battery with a soldering iron at 365°C. Heat to remove the protection board.

    Editar

  2. Reuse Old Batteries As A Power Bank, Measure the battery voltage: paso 2, imagen 1 de 3 Reuse Old Batteries As A Power Bank, Measure the battery voltage: paso 2, imagen 2 de 3 Reuse Old Batteries As A Power Bank, Measure the battery voltage: paso 2, imagen 3 de 3

    • Measure the battery voltage with a multimeter. The voltages of the two batteries we have are 3.66V and 3.76V respectively.

    • As you can see, both batteries have the anode on the left and the cathode on the right.

    • Anode (Positive terminal)

    • Cathode (Negative terminal)

    • 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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  3. Reuse Old Batteries As A Power Bank, Solder the terminals: paso 3, imagen 1 de 3 Reuse Old Batteries As A Power Bank, Solder the terminals: paso 3, imagen 2 de 3 Reuse Old Batteries As A Power Bank, Solder the terminals: paso 3, imagen 3 de 3

    • Apply double-sided tape to the battery and align the anodes and cathodes of the two batteries.

    • Solder together the anode and cathode of each battery with a soldering iron at 365°C.

    • Measure the voltage with a multimeter. Ensure the voltage is 3.7V.

    Editar

  4. Reuse Old Batteries As A Power Bank, Solder wires to the terminals: paso 4, imagen 1 de 3 Reuse Old Batteries As A Power Bank, Solder wires to the terminals: paso 4, imagen 2 de 3 Reuse Old Batteries As A Power Bank, Solder wires to the terminals: paso 4, imagen 3 de 3

    • 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.

    • Next, solder the red wire to the anode and the black wire to the cathode.

    Editar

  6. Reuse Old Batteries As A Power Bank: paso 5, imagen 1 de 3 Reuse Old Batteries As A Power Bank: paso 5, imagen 2 de 3 Reuse Old Batteries As A Power Bank: paso 5, imagen 3 de 3

    • Press down the anode and cathode.

    • Apply electrical tape, making sure to fully cover the anode and cathode.

    • Install the button on the middle frame and the power board.

    Editar

  7. Reuse Old Batteries As A Power Bank: paso 6, imagen 1 de 2 Reuse Old Batteries As A Power Bank: paso 6, imagen 2 de 2

    • Apply tin on the bonding pad of the anode and cathode with a soldering iron at 365°C.

    • Anode (Positive terminal)

    • Cathode (Negative terminal)

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  8. Reuse Old Batteries As A Power Bank, Solder to the power board: paso 7, imagen 1 de 2 Reuse Old Batteries As A Power Bank, Solder to the power board: paso 7, imagen 2 de 2

    • Solder the anode of the battery to the anode of the power board.

    • Solder the cathode of the battery to the cathode of the power board.

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  9. Reuse Old Batteries As A Power Bank, Secure the battery: paso 8, imagen 1 de 2 Reuse Old Batteries As A Power Bank, Secure the battery: paso 8, imagen 2 de 2

    • Press the button. For this project, the power bank is 33% full.

    • Apply foam to secure the battery.

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  10. Reuse Old Batteries As A Power Bank, Reattach the casing: paso 9, imagen 1 de 2 Reuse Old Batteries As A Power Bank, Reattach the casing: paso 9, imagen 2 de 2

    • Install the middle frame to the housing and put on the bottom plastic cover.

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  11. Reuse Old Batteries As A Power Bank, Test charging: paso 10, imagen 1 de 2 Reuse Old Batteries As A Power Bank, Test charging: paso 10, imagen 2 de 2

    • Connect the phone to the power bank. The phone can be charged.

    • Connect the charger to the power bank. The power bank can be charged too.

    Editar
Conclusión

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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REWA

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3 comentarios

Do the batteries automatically stop charging at full? Like can I add iPhone batteries to the powerbank I already have?

Mark Anderson - Contestar

@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

shingle - Contestar

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 -

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