I was soldering batteries together when I was 13 for my RC car collection. I would take Radio shack batteries (when their 3000 mah packs were hot shit) and would split them in a 3x 3 vs the standard 2x4 configuration for my custom build indoor carpet cars to help with the balancing. I would even soldering in an extra cell in some cases and would hide them off to the side, Those little things would zoom by at 60-70mph without breaking a sweat. Miss that stuff.
Im known as Kwtony in many places, but in the island of Key West(get it kw) most people know me as Iphone Tony....I made a living off of repairing water damaged iphones down here, amongst 10,000 other things...
I had to magnify those surface mount resistor 3 times in order to get a photo of them. I may wear a loop sometimes when I work, but usually I prefer to work freehand and without magnification, those components came from an iphone 5.