Hi I have robotics project that uses 4 sg90 servos , an esp32, and 4 motors. How do I determine if my power source (4 18650 batteries in series attached to a lm2596 module) is enough to power it
You decide how many of those items will be operating (specifically drawing stall current) at the same time, and see if that adds up to more than three amps.
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It's four amps
So, a rethink then.
Can you give me a good alternative?
You will need 3 A for the servos alone. Use 3xLM2596 modules: one of the motors, one for the servos and one for the ESP32.
You may need to use battery packs in parallel for the total current requirement.
From a very quick Google search, maximum discharge current is 1C
The same current as from one battery.
Leo..
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How much amps do I need to power 4 motors controlled by an ln298n module, 3 servo and an esp32?
Ask this guy
The power the motors take doesn't depend on how they're controlled.
The motor & servo specs will tell you how much power they take.
The power required by the electronics will be negligible relative to the motors & servos.
1MA should do the trick.
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One million amps?! 
Yes but it should be 1 MegaA
So are four 18650 batteries in series enough?
You haven't given any details of what motors or servos you're using - so impossible to say.
Again, the motor & servo specifications will tell you both what voltage they require and what current they will draw.
Do not cross post. Flagged for moderator.
I have merged your cross-posts @valerian66.
Cross-posting is against the Arduino forum rules. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend a lot of time investigating and writing a detailed answer on one topic, without knowing that someone else already did the same in the other topic.
Repeated cross-posting can result in a suspension from the forum.
In the future, please only create one topic for each distinct subject matter. This is basic forum etiquette, as explained in the "How to get the best out of this forum" guide. It contains a lot of other useful information. Please read it.
Thanks in advance for your cooperation.
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What happened when you tried to use 4 18650 batteries in series? When you try, also try to measure the current being drawn by the thingys and let us know what that current drawn is.