The K100 is a very popular mechanical mod. It's not one that I have personally used, though.
I would strongly recommend doing some background research before using a mechanical mod. Read the rechargeable batteries page and Baditude's blogs on understanding mod batteries, read up on mechanical mod safety, watch some videos on mechanical maintenance, own a multimeter and use it to regularly test your batteries, atomizers, and mod. Remember, with a mechanical mod, you're the safety feature. If you're going to do it, do it carefully.
You will definitely want the highest quality batteries you can afford and a high quality charger, both from a reputable source such as RTD Vapor, Lighthound, or somewhere comparable. Read the rechargeable batteries page and Baditude's blogs on understanding mod batteries first.
I would strongly recommend doing some background research before using a mechanical mod. Read the rechargeable batteries page and Baditude's blogs on understanding mod batteries, read up on mechanical mod safety, watch some videos on mechanical maintenance, own a multimeter and use it to regularly test your batteries, atomizers, and mod. Remember, with a mechanical mod, you're the safety feature. If you're going to do it, do it carefully.

You will definitely want the highest quality batteries you can afford and a high quality charger, both from a reputable source such as RTD Vapor, Lighthound, or somewhere comparable. Read the rechargeable batteries page and Baditude's blogs on understanding mod batteries first.