Hi,
I am doing a project with a DC Brushless motor with a Stall Current of 20A at Nominal Voltage (12v). It a "no load" current draw of .52A @12v.

Link to motor: https://www.servocity.com/612-rpm-hd-premium-planetary-gear-motor

Due to the size of my poject I was hoping to use three Samsung 25R 18650 batteries wired in series. They have a discharge current of 20A Maximum Continuous.

Link to Battery: https://www.imrbatteries.com/samsung-25r-18650-rechargeable-battery/



At max charge the batteries could be 4.2V each, putting the voltage just above the nominal motor voltage and raising the stall current above the rated discharge current of the battery. In addition to this I am running some LEDs, a microcontroller and some other small components off of the same battery. Is this safe? Would I be pushing the batteries too hard? What if I used a BEC for the motors?

The battery page has a lot of warnings about it being unprotected and using only proper circuitry etc. Is this out of the realm of a hobbyist given how close to the limit I am pushing the battery?

In a perfect would I'd be able to wire these in, and add some kind of charging point so they can stay contained within the project and be recharged as necessary. Is this too wishful thinking?

My alternative is to use two of these wired in series: https://www.amazon.com/TATTU-Airsof...544119539&sr=8-3&keywords=tattu+stick+battery

 

if your motor stall current is 20A you should get a cell that can handle well over 20A - the following are the discharge rates for this Samsung

• Max. continuous discharge current: 20A.
• Safe pulse discharge ratings: 95A < 0.5 sec, 65A < 1 sec, 40A < 5 sec, 30A < 6 sec.

It may be ok but i would be more comfortable to get a cell that can handle over 20A for greater than the times above, there is probably a high probabability you will be in stall conditions quite alot so need to look at worse case, and that means getting a cell that can handle well in excess of this relatively easy.

This LG can do 30A continuous

http://queenbattery.com.cn/index.php?controller=attachment&id_attachment=97

 

It goes without saying do not fiddle with these unless you know what you are doing - you need a proper charging IC and appropriate monitoring circuitry also.

 

Great thanks for the lead on the other battery, that is really helpful!
Yes, this project is still in the planning stage and I will be getting the proper boards to keep things safe.
Thank you.