Hi , I've designed a circuit and I supply it using my little adjustable supply at 12v.
To take long story short , I found some batteries like 12v 23A-27A but I do not know if they can produce enough current.
I Share my current outta suply graph.
I wonder if could I use 3.7V li ion battery to supply it or that 12V27A batteries.
Could you lead me ?
Btw , it does not have to be supplied from battery but I wonder if I could.
12V27A

 

You need to look at the datasheet for the battery (which, admittedly, are not nearly as informative as they used to be).

https://www.duracell.com/wp-content/uploads/2020/02/MN27_0620191.pdf

From this, you can see that the nominal load for this battery is 20 kΩ, which results in an initial current of about 0.6 mA, or a tiny fraction of the current you shown in your graph. So it's unlikely that this battery can deliver the currents you are looking for (without putting a bunch of them in parallel). Even if it could, the capacity (at a fraction of a milliamp) is only 20 mAh, so even at your minimum draw shown it would barely last an hour and at the other end of 60 mA it would last about twenty minutes In reality, the actual mAh as just a high drain rate will be quite a bit less and you might be lucky to get fifteen minutes or so.

 

Seems like 12V batteries are not a good option for me.

 

Well, those 12 V batteries aren't. But there are lots of 12 V batteries out there.

 

You can easily have two 12 volt batteries able to deliver 100 AMPS for quite a few minutes. BUT the last time I checked the price they cost $120 each in large quantities.
So the first step is to determine how much current your circuit will require to deliver the performance it is intended to deliver.
That is generally a bit more power that the circuit will deliver to whatever it is controlling.

 

Guys I guess i will not connect it to a battery

 

Guys I guess i will not connect it to a battery

8 AAA cells in series would be fine. Holders for four of the are common, you might find a holder for 8.

 

8 AAA cells in series would be fine. Holders for four of the are common, you might find a holder for 8.

Yes , I have seen some. In case I start producing I will keep it mind

 

Providing more information about the actual requirements will allow others to provide better advice.

 

Providing more information about the actual requirements will allow others to provide better advice.

You are right , but the idea of battery supply is for my rangefinder project.
I wait for semester to start so I met w my prof and see If i keep developing the project.

 

You are right , but the idea of battery supply is for my rangefinder project.
I wait for semester to start so I met w my prof and see If i keep developing the project.

Since this is an academic project, it belongs in Homework Help. I'll move it there for you.

 

Since this is an academic project, it belongs in Homework Help. I'll move it there for you.

No it is not at all. It was just an idea to what would it be like If I made it portable.

 

Since this is an academic project, it belongs in Homework Help. I'll move it there for you.

Yo I hope i come back with good news

 

OK, now we have a hint about the size and function of the battery powered device. An actual starting point.

 

OK, now we have a hint about the size and function of the battery powered device. An actual starting point.

Hi sir , this is the device.
I am not sure if I want to make it battery powered. Just researching.

 

A simple option that comes to mind is to get a USB power bank of a convenient size to carry in a pack or even affix to the range finder and use it to power a "battery eliminator" -- which is just a small DC-DC converter. You can get quite small ones at fixed output voltages. They probably have them that are specifically intended to be powered by these power banks via something like USB C.

 

A simple option that comes to mind is to get a USB power bank of a convenient size to carry in a pack or even affix to the range finder and use it to power a "battery eliminator" -- which is just a small DC-DC converter. You can get quite small ones at fixed output voltages. They probably have them that are specifically intended to be powered by these power banks via something like USB C.

Yes , Ive seen step up converters small ones , good idea