I have a 9v battery (alkaline) device that I need to convert to rechargable?

Question

I have an electric ignitor with a 9v battery in it (alkaline) and I'd like to covert the device to be rechargeable. I want to be able to replace the 9v battery with a rechargable one and wire in a battery charger so that I can just plug in an AC plug and charge the 9v when necessary. I know this must be possible, but don't have a background in electrical engineering. Essentially, I'd like to be able to plug it in and charge the battery.

Answer 1

they do make "9v" rechargeables, but they are really about 7 volts, unless you buy a "real 9v" and expect to pay double for the battery.

You will need to build or buy a 9v charger, modify the device for a charge connector.

You can buy a lot of 9v batteries at Sams club for the cost of one 9v rechargeable and powersupply and mods to the ignitor.

Answer 2

What you're looking at is not easy to do yourself, especially when you have no experience. You're better off just using a rechargable 9v battery and doing the manual in-out required.

If you want to charge it by plugging it in, you can use a transformer and simply hook it up on either terminal of the battery - be aware however you need a gentle charge rate or you might fry/burn your device. You also MUST observe the charge time, as overcharging can make it fry/burn too.

Answer 3

The best way is to remove the battery completely with a 9 volt power source and just run the ignitor from that.  You can't use a battery charger because many of them require some voltage from the battery to be charged before they turn on.  But there are small, inexpensive 9 volt power supplies available and they're far less than a battery and charger.  The link below leads to one source but there are many others.