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Those coin cell batteries are typically alkaline so they don’t explode like Li-Po or Li-ion.
When you buy those battery kits, they have the tabs already tacked on so you’re not soldering directly to the battery. For the tab aspect, you still cant go all gorilla on it and use a propane torch but with a real iron it’d be fine.
The big thing I see with a lot of people new to electronics is they want to jump right into fixing their prized possession, sorta like people who want to get into fixing watches that they found in great grandpappy’s sock drawer. To do this right, you want a good soldering iron with temperature control and some practice boards. They sell tons of kits for this. You can get yourself a blinky little circuit board and feel a lot better about screwing around with hot metal.
Electronic components can typically handle a lot more heat than you’d think.
