12v power supply that lasts a while

[jatgm1]

where can i find a battery pack of some sort that is small enough to fit a small tracked vehicle chasis (yahboom g1) but lasts a long time and can provide more power. when using both motors for two long its movement becomes choppy but only after some use. it seems there isnt enough power as the lights dim a bit as well. with both motors on at low or medium battery. on full charge it can run without any choppyness at all. (to clarify i mean instead of the vehicle moving consistantly fast it kinda chugs and clicks like a locomotive. i thought maybe the treads were getting jammed up but their not.)
why?
my plan is to add more motors but i know it wont be able to handle 4 separate "370" motors at the same time on high speed. does anyone know of a device that holds a bunch of 18650 batteries, runs them in paralell/series to get to 12v and can charge then on a dc charger while delivering 12v consistantly for a driver board that powers the pi? im hoping to make this last as long as possible with as many batteries as possible. preferably with 18650 batteries because of price availability and how easy it will be to swap batteries. i just began learning python as well so any resources to help learn to code python as it relates to activating and deactivating gpio pins would be awesome, with this matter would be awesome too! thank you! (https://www.youtube.com/watch?v=rfscVS0vtbw&t=382s im an hour into this)

[W. H. Heydt]

Step 1: Calculate how much power you are going to draw, in Watts (W).
Step 2: Determine how long you want the system to run, in hours (h).

That will give you a figure in Watt-hours (Wh) for the minimum energy capacity of the battery you need.

Step 3: Add at least 20% for conversion losses. You may need to add more, depending on how far down the battery can be safely drained.

A semi-alternative solution would be to look for a "prime mover" instead of a battery. Things like an engine (such as a Sterling motor) or Hydrogen fuel cell. The energy density per unit weight for fuels is generally significantly higher than for battery chemistry, especially secondary (that is, rechargeable) batteries.

[jatgm1]

https://www.rcgroups.com/forums/showthr ... -370-motor

so then if one motor is 100 watts is 4 400 watst? making all 4 draw 66.6 repeating amps? that doenst sound right, the mmotors alone would only last like a minute.

https://www.digikey.com/en/resources/co ... ttery-life

how ru supposed to find the amount of power it draws and how do you calculate it?

[jatgm1]

im really just trying to find a 12v power supply that can power stuff and charge at the same time and can hold a lot of 18650 batteries. like maybe a board i can solder a bunch of 18650 batteriy holders too and pack them all onto the tank somehow and then somehow solder a barrel jack to the board that will charge the batteries while it powers it. then get some slot car tracks and try to make a charging base it can drive onto.

[boyoh]

Learning Coding And python will not help you one bit with this project , Until you have a good understanding of
basic electrical and electronic power calculation's , You are well out with what you know now , I think you seem to
be lacking in Common Sense

PS When you load the Cart make sure the Horse Can pull it If you use two Horses make Shure thy are in Parallel and Not in Series

Regards BoyOh

[rpdom]

When you load the Cart make sure the Horse Can pull it If you use two Horses make Shure thy are in Parallel and Not in Series

An interesting analogy, but not one which would hold up well.

Is that two horses one in front of the other, or two horses side by side?

Either way you get the pulling power of two horses. The maximum speed won't change.

I'm not disagreeing with the point of your post, however.

[jatgm1]

so it was actually the fact you can change the power output.

[Imperf3kt]

Adding more batteries comes with its own drawback - weight. More weight means you need more powerful motors to move that weight (which also usually means more weight) and eventually you reach a point where the thing is huge just to move a pebble.