which will give your 9 volt a longer battery life. the best part is that it’s easier and cheaper to do it this way. just grab an lm7805 from your local hacker store and wire it up. connect ...

If a device stops working, it can be tough to tell if its battery has died or the product itself. There are easy ways to rule ...

All of the common disposable alkaline batteries from AAA to D are single cells. The exception is the 9v battery which actually has six smaller cells inside of it. [Tom] took a look inside three ...