@Dimitris or
@pbusardo, l was wondering, for the longevity of the internal battery, at what point is it best to charge it?
I’ve read that internal batts should be charged at about 30% power left and not to let it get down bellow 10-15 %. What do you recommend with Kroma?
Vonnie
I vape therefore I am
I know I am not Phil or Dimitris, but this is a basic battery question.
First, remember that there are two main types of rechargeable batteries. Nickel Cadmium, and Lithium Ion. Nickel Cadmium is a very safe battery that usually outputs around 1.2 volts of electricity. It is an older style, invented over 100 years ago. They have a memory cell capacity, meaning to prolong the life of the battery, it is best to discharge it fully then recharge it. This is the type of battery most people think of when they hear "rechargeable batteries"
Sometime around 1990, Nickel Metal Hydride (NiMH) came into mainstream. A NiMH battery could provide a 1.4 volt discharge. They are also considered a fairly safe battery.
Lately, Lithium Ion batteries became mainstream. Lithium Ion batteries provide a 3.7v nominal charge (4.2v after charging, which drops quickly to about 3.8v, then slowly decreases after that). They are NOT considered a safe battery because if you stray away from the recommended charge/discharge amount, you could damge the battery, possibly leading to them exploding. Because of the risk of injury and fears of lawsuits, the major companies have never released an end user battery. Instead, they pass the safety responsibilities to the companies, and sell them as "cells". Since they provide the most power, they are currently the most ideal battery for vaping. But keep in mind, ANY lithium Ion battery you use was not originally designed to be a drop in battery like what we're using them for. The built in batteries in vaping devices should be treated identical to the replaceable 18650's we use in vaping devices... the difference being, you cannot simply pop in a new one when needed.
The main "enemy" of the Lithium Ion battery is heat. Rapid discharging or charging of the battery could lead to excess heat.. damaging the battery or causing it to go into a thermal runaway. Some Lithium Ion batteries have built in safety fuses in them, but they limit the output current of the battery. Since many vapers require a high demand of power, they go with non protected cells. This leaves the mod devices to regulate the power output as to be safer. With a mechanical device, the only limitation is the coil you use in the atomizer. Lithium Ion batteries have no "memory effect".. so you can charge them at any time during it's discharge cycle. However, if the battery falls below 3.4 volts, there is a change in the battery chemistry, causing a chemical reaction inside. So never let your battery run too low. It is better to charge the battery often.. even if it hasn't reached %60 of it's charge. Do not leave your lithium ion battery in a hot car for a long time... the heat will slowly deteriorate the battery. Also, if you feel the battery start to get warm, it's better to slow down, or change the battery. Let the battery reach room temperature before you put it on the charger, or let it cool down for a while before you charge it. Most Lithium Ion batteries have an amp limit. Essentially, it is a charge/discharge limit where the battery starts to heat up. If you pass the heat limit, it will go into what's called a thermal runaway, where the battery will continue to discharge on it's own at an uncontrollable rate. this is the thermal runaway, and can lead to it exploding or venting toxic gas.
Lastly, note that everything I said also applies to ANYTHING with a Lithium Ion battery. This includes laptops, tablets, cellphones, or anything else. Lithium Ion batteries are not just for Ecigs. They have been known to go into a thermal runaway while someone is using them. It's sometimes scary to think that the device you put right next to your ear has the potential to explode. Major companies like
Apple,
Samsung, and even a $100,000
Tesla model S electric car is subject to the dangers of Lithium Ion batteries. Links to just a few stories.