Bugs, Mosquitoes, Insects are common problem and it is evident that instead using repellents like goodnight, mortein, Electric Racket Bug Insect Zapper / Fly Swatter / Mosquito Killer is becoming commonly used … Most of these Mosquito Killer Rackets are China made and available at cost of $15~25 USD….. $19.99 Best Buy
These are re-chargeable battery type and you can plug them inside A/C socket overnight which is good point in terms of re-usability.
However the re-chargeable battery used inside is China made and not having long life, so in few months you will realize that your Mosquito Killer Racket is no more useful due to battery issues. It starts immediately discharging in few minutes.
Then what do you do ? Normally you will throw it out due to its dirt cheap price and buy a new one.
But as a Environmental concern I was against throwing it out just because its battery life got over.
So I decided to repair the racket,
This is how the modified USB powered Mosquito Killer Racket looks like after modification and now I can easily use it with my powerbank 🙂 for long long time than before …
Step 1 :
Open the racket by removal of 5 Phillips head screws (Screws with plus sign grooves), you will find 2 battery cells soldered to the PCB inside, just look at snap below of the battery cells they have used.
I have specially added photo of its specifications on right hand side of image.
The first option I thought of was to replace these with rechargeable pencil cells and continue using … But the branded rechargeable pencil cells costs around $10 USD which is higher price than buying new Mosquito Killer Racket !! so this option is ruled out.
So I thought of alternate option where I will connect it to my USB power bank 🙂
Step 2 :
Remove the pencil cell connections. Throw the cells 😛
Take two wires which were going from the cells to the PCB circuit inside.
You can easily take the power connections out from the racket, and then closed the lid of (see image below RED and WHITE wires out from racket)
Step 3 :
Get old (or new) USB cable, cut it at the micro-USB end.
You will find four wires inside the USB wire out of which two wires are for power. So you need to get RED & Black wire and connect them to the two wires coming out from your racket.
Unfortunately all the wires from my USB cable were of White colour !!! so what ? I connected one by one to small LED bulb and found which are the ones giving 5V DC power (I used those connections where my LED light glow)
Colour codes inside USB cable are as follows :
- RED wire = 5 volts DC as Positive wire
- BLACK wire = Paired with the red wire because this wire is Ground wire or Negative Wire
- WHITE wire = Data wire in positive
- GREEN wire = Data wire Negative
See photo below where I have connected my USB power cables to the racket power points.
This is how the racket connections look, after which I just soldered the wire joints.
Finally I just taped the connections which will secure the joints during rough use .. and connected to my USB power bank … This is how the finished and working Mosquito Killer Racket looks like …
I hope this tutorial will be helpful for you
** WARNING **
Please note that the voltage and power from USB bank is more than that required by the Mosquito Killer Racket and depending upon the make of racket it may burn the racket circuit also, so it is advised to experiment this at your own risk. This website do not take any responsibility on issues / accident that may happen due to such experiments. Basic electronic knowledge is required to try such things that shall be understood.
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