Every mod out there requires a battery in order to work and this is why we have two types of products in this category – the ones that come with internal batteries or the ones that need external batteries to deliver power to the atomizer.
Devices with internal batteries are usually addressed to beginners as they just require constant recharging via the provided micro-USB cable. The internal batteries are usually Li-Po and are non-removable. This means that they will last for a few hundred chargers, after which their capacities will slowly diminish until they become obsolete. This is something that happens within two or three years of usage and since the battery can’t be swapped with a new one, the mod needs to be discarded.
On the other hand, devices that use external batteries can always be re-animated with a new cell when the old one becomes obsolete and at the same time they have bigger autonomy since the user can easily swap a discharged battery with a spare freshly charged one. But using external cells usually means you have to buy them yourself and with so many models out there it’s probably hard to make the correct choice every single time. This is why I decided to write this small guide to mod cig batteries, and help you understand the main differences between amps, capacity and their link to the resistance of the atomizer.
There are essentially four types of batteries commonly used with mods: 18350, 18500, 18650, and 26650, out of which the 18650 model is by far the most popular. Many of the 22mm mechanical mods out there use 18650 cells and due to their outstanding performances they are also used with a variety of electronic mods.
Any battery is characterized by two main features: the continuous discharge rate (measured in Amps) and the capacity (measured in mAh). The Amps show how much current can be continuously drawn from the battery until it becomes discharged and the capacity is directly linked to the duration of a single charge. As a general rule you can’t have the best of both worlds, therefore a battery with a very high continuous discharge rate will have a smaller capacity and vice versa.
When using an unregulated mod (like a mechanical mod) the current inside the battery obeys Ohm’s Law and it is closely linked to the resistance you’re using on your atomizer. The lower the resistance the higher the draw from the battery and you always have to be sure this doesn’t surpass the limit on your cell. A fully charged battery has a voltage of 4.2V, and Ohm’s Law states that I = U/R, therefore if you use a 0.4 Ohm resistance I = 4.2 / 0.4 = 10.5A. Therefore a battery with a continuous discharge rate of 20A will handle the load without any stress, but if you lower the resistance to 0.2 Ohms (I=21A) the draw is bigger than what the battery can handle and you’re entering what’s called the red zone where the cell could violently vent and release hot gases.
On regulated mods we don’t have this to worry about as they have built in protections, but on a mod that goes over 40W it’s better to use a 25A battery and over 75W a 30A battery just to be on the safe side, especially if you plan on using it with a sub ohm tank that reaches 0.1 – 0.2 Ohms.
The only thing you always need to make sure is that you buy your batteries from top rated brands like Sony, Panasonic, LG, AW or Samsung and stay away from offers that seem too good to be true.