How to make a 9V battery with USB charging

How to make a 9V battery with USB charging

9V batteries are not often used, but are still used in various toys, radios, and measuring instruments. Their resource is not very durable. In order not to constantly buy these batteries, you can make such a battery yourself with USB charging. Everything is made from a ready-made module and a lithium battery.

Will need


  • Old crown.
  • Mini switch.
  • Charging converter module -
    How to make a 9V battery with USB charging

  • Lithium battery 3.7 V -
    How to make a 9V battery with USB charging


How to make a Krona type battery with charging from 5 V


Remove the braid from the old battery.
How to make a 9V battery with USB charging

We carefully open the case using a sharp scalpel.
How to make a 9V battery with USB charging

We recycle the insides. We need the plastic case itself with the block.
How to make a 9V battery with USB charging

We mark the housing for the board connector.
How to make a 9V battery with USB charging

We cut out the window: first we burn it with a soldering iron, then we shape it with a sharp scalpel.
How to make a 9V battery with USB charging

Solder the wires to the board. It has all the symbols. We solder the output of the converter directly to the block, and solder the contacts from the battery to the battery only through a switch.
How to make a 9V battery with USB charging

We check the operation with a multimeter. When the switch is on, 9 Volts should come out at the block.
How to make a 9V battery with USB charging

We glue the light guide to the LEDs on the board with super glue.
How to make a 9V battery with USB charging

We glue the board into the case.
How to make a 9V battery with USB charging

In the block we make a cutout for the switch and a hole for the light guide. Glue in the switch.
How to make a 9V battery with USB charging

Glue the block to the body. We bite off the light guide.
How to make a 9V battery with USB charging

Our 9V Krona battery is ready.
How to make a 9V battery with USB charging

Can be put on charge.
How to make a 9V battery with USB charging

Red Light-emitting diode lights up when charging is in progress, green when charging is complete.
Now you can check it in practice.
How to make a 9V battery with USB charging

How to make a 9V battery with USB charging

The switch serves to disconnect the converter from the battery, since it consumes little current even in idle mode. And if the device where the battery is installed is idle for a long time, it must be turned off.

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Comments (2)
  1. Sergey
    #1 Sergey Guests 16 December 2020 18:54
    4
    So again you need to buy a module. Another problem.
  2. Sergey K
    #2 Sergey K Visitors January 12, 2021 00:51
    0
    Interesting. But it’s not clear why fence a garden if you can buy a ready-made battery for the same money.
    Another thing is that the controller allows you to adjust the output voltage in a wide range... You may need a non-standard voltage.