Instructables

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?

VitaminX5 months 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.

mpilchfamily5 months 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.

bobbiy (author)  mpilchfamily5 months ago

okay, thanks for the reply.