# DIY Li-Ion Battery pack **URL:** https://foil.zone/t/diy-li-ion-battery-pack/18653 **Category:** Electronics (ESC, remote, batteries) **Created:** [July 17, 2023, 7:12pm UTC](https://foil.zone/t/diy-li-ion-battery-pack/18653 "2023-07-17T19:12:43Z") **Posts on this page:** 1 **Showing post:** 4
### Author: ![sat\_be](https://foil.zone/user_avatar/foil.zone/sat_be/32/35523_2.png) [@sat\_be](https://foil.zone/u/sat_be) #### Post date: [July 18, 2023, 5:43am UTC](https://foil.zone/t/diy-li-ion-battery-pack/18653/4 "2023-07-18T05:43:06Z")
See the link below how I built my batteries. Built two, the first one I spotwelded the terminal nickel strips first and soldered afterwards. The method for the 2nd one is better, I first soldered 8 AWG to a nickel strip and then spotwelded it to the cels. Less thermal stress. > [@Daniels (un)geared inflatable (slowly built)](https://foil.zone/t/daniels-un-geared-inflatable-slowly-built/8069/81): > > New battery Pack Buit a new pair of batteries from Samsung 21700 40T. They were available for a good price from nkon. I built them like the first ones, apart from the main wire connection to the nickel strip. This time I soldered them to the nickel before spotwelding. This way the cells do not absorb heat from soldering which could damage them. Tested them once, they work great. Capacity is slightly lower than the molicel p42A pack but that’s justified by the lower price of the cells. … --- _[View the full topic](https://foil.zone/t/diy-li-ion-battery-pack/18653)._