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How to charge a rechargeable 9v battery? Answered

hi guys,

I am using a lot 9v volt batteries so I thought why don't I buy rechargeable but I found out that the charges where expensive. so does anyone know a circuit to make a charger?

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dracones4242

3 months ago

A lot of the comments will not work or will end up causing damage to your battery, power supply, or possibly yourself. Remember.. a rapid unscheduled disassembly of a battery always sucks. You need to find a dc power supply with an output equal to or just over the voltage of your battery. If you have a 9v battery, you need 9-12v DC power supply or "wall wart", closest to the capacity is best, you can only charge to the voltage of the power supply. so a 5v dc supply will not charge a 9v battery. You connect them "reversed" from how you would use them.. so "positive goes to the positive lead" of the battery and "negative to the negative lead", else you will reverse the polarity of the battery and cause gasses to build up... Connect the power supply to the AC wall socket and carefully monitor the battery for temp, once it starts to warm up, disconnect it and wait for it to cool, then repeat. The best way to charge a non-rechargeable battery is to use a quick on-off cycle, by building a simple circuit which can be found on google. so quick short charges are best vs a long charge.

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AhmedV4

2 years ago

yes its simple get a usb wire the connect it to then connector which you can get and then connect it to a 5v input and then it should chargehttps://www.google.co.uk/search?q=9v+adapter&safe=strict&espv=2&biw=1440&bih=770&source=lnms&tbm=isch&sa=X&ved=0ahUKEwico_SfiOfPAhXhBsAKHcBPDT4Q_AUIBigB#safe=strict&tbm=isch&q=9v+connector

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mpilchfamily

5 years ago

Making your own charging circuit will cost more than buying the actual charger. Get the charger it's well worth the money. In the long run you will spend more ondisposable 9V batteries than you will on the rechargable batteries and the charger.

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BenG58mpilchfamily

Answer 3 years ago

It would definitely be cheaper to build your own. In almost all situantions...

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VitaminX

5 years ago

You can use your ordinary flashlight charger too. If the output of your charger is 9 or 10 v, jump wire it so that the +ve terminal (the lead inside the charger pin) is connected to the -ve terminal of your battery and -ve terminal of charger (outer lead of the pin) to the +ve terminal of your battery. It works. The drawback is that you cannot know when the battery is fully charged.

If the output of the charger is greater than 10 v. use an voltage regulator in between. Rest is up to you.