2x2 18650 Cell Holder

A 4S 2800Mah Battery pack made up from Molicel P28A cells that have a 35A discharge rate for my electric powered control line model Super Combat Streak.
I use "BGA" size solder wick for the inter-cell connections and 16ga battery lead wire to an XT30 connector. The spacers are a slip fit to the cells. The end caps keep from shorting on things.

I use Molicel P28A cells. These are 2800mah capacity with a 35A max discharge rate.
I solder all battery and wire connections.
I use size "BGA" solder wick for the battery interconnections.
I use 16 gage Castle Creations wire leads terminating to XT30 connectors.
All soldering is done with a 40watt iron and a chisel tip.

1st-I clean each battery terminals with a few swipes of scotch brite and then wipe 'em with a bit of lacquer thinner.
2nd-I pre-tin the cell terminals with a bit of 60/40 rosin core solder. It only takes a few seconds to achieve an acceptable blob.
3rd-I assemble the 4 batteries into the 3D printed cell holders t