Hi, I want to connect a bank of pp3 batteries to deliver 12v to power cob

 

So what is the issue?

 

Hi, I want to connect a bank of pp3 batteries to deliver 12v to power cob

PP3 batteries have a nominal voltage of 9V. How are you planning to combine them to get 12V?

 

Hi,
PP3 batteries can be a bad choice, they have very little power (Guts).
AA's would be a better choice, 8 * 1.5volts.
Good luck........

 

I can see a few complications in the arranging of a group of 9 volt batteries to supply a 12 volt load. If the TS will explain the connection scheme that they have in mind I will be happy to assist, I do anticipate some basic challenges.

 

When they use a voltage stepup module some people say it causes whining noises and drains the low voltage battery quickly.

 

Switching supplies of any type do produce noise, some much more than others, and every one of them requires some amount of filtering. In addition, none are 100% efficient, and so in every case there input power from whatever the source is will be greater than the power delivered to the load. So they do drain the battery supply, "Quickly" is a relative term in this aspect.

 

Take apart a PP3 9V battery to see the tiny AAAA cells in it. Any load (even a voltage stepup converter) drains it quickly.

 

My new Energizer AAA Ni-MH battery cells are not working well. A charge does not have much capacity and the fully charged voltage is less than older ones. I am surprised that its label says, "Made in China for Energizer".
They costed more than the excellent cells that were Made in Japan for years.

Duracell Ni-MH battery cells have been made in China for a few years. They also work poorly.