How to charge a rechargeable 9v battery?

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?

sort by: active | newest | oldest
AhmedV41 year 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 charge

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.

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

bobbiy (author)  mpilchfamily3 years ago

okay, thanks for the reply.

VitaminX3 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.