Lithium Ion battery packs 14.8 v??????

[JimmyB]

https://smile.amazon.com/dp/B002Y2LJW0/?coliid=I2B7BSDB7ODSDQ&colid=1CY05ADR1DW8I&psc=1&ref_=lv_ov_lig_dp_it

These have worked very well for me. Haven't gone wrong with tenergy. Two in series gives you the voltage. 4 in series parallel and they'll keep on going.
This is one of the two chargers I use.

https://smile.amazon.com/Tenergy-TLP-4000-Universal-Charger-3-7V-14-8V/dp/B007MD54NQ/ref=sr_1_24?crid=2PLXOI2NFI9AI&keywords=tenergy+charger&qid=1667608038&qu=eyJxc2MiOiI0LjUxIiwicXNhIjoiNC40NiIsInFzcCI6IjQuMjQifQ%3D%3D&s=electronics&sprefix=Tenergy+%2Celectronics%2C139&sr=1-24

I see the battery description says it has built in protection

 

[GAP]

I made my own Li-ion packs rather than buying any more premade LiPo's which I had no success with.
I avoided using cells with built in protection as I was using a Battery Management System (BMS) board

Making 18650 Lithium Ion Battery Packs

After the failure of my third model store bought LiPo battery in my Bachmann Shay and Consolidation ("Connie")I decide that I would make my ...

ringbalin-light-railway.blogspot.com

Inspiration and guidance was from here.

A quick introduction to batteries for model trains

Narrow gauge large scale model garden railway. Battery powered, radio controlled locomotives, some Bluetooth. Set in Cheshire UK in 1930s

riksrailway.blogspot.com

I have a similar charger ti the imax described in the blog.