4/4/2023 0 Comments 18650 battery pulse ratings![]() ![]() Or in other words – take some petrol car battery. Just count with me – 32g weight fully charged to 4,25V and 9,9Ah – that would be almost the energy density per gram that a NUKE has!!! There is NO SUCH THING (yet) as 18650 cell with 9900mAh capacity! A battery with a lower internal resistance will, generally, be able to sustain higher Amp (current) loads.Ĭoming soon, Part Two… battery testing, alternative chemistries, and more battery geekery! A battery’s internal resistance increases over its lifetime, so that by the time a battery is dead it will have a very high internal resistance. This will always be expressed in Ω, or ohms. Even if it says the maximum current can be sustained continuously, in practice it’s better to stay on the safe side with a slightly lower discharge current.įinally, we have the internal resistance of the battery. As the wording implies, this is the maximum discharge current in amps… to a point. Check your battery charger to make sure you don’t exceed this figure.Ĭontinuous discharging current Max is an important figure for anybody who pushes their devices to the max, especially vapers. Most devices will have their voltage ratings printed prominently on the label or in the instruction manual.īatteries are usually charged at a higher voltage than they’re discharged, as you can see in the charging voltage figure. You don’t want your device to exceed that voltage when discharging. Much more important is the discharge current and temperature they used to get those figures. The mAh capacities are never exact.ĭon't worry too much about the difference between rated and nominal figures. In reality, batteries can have different mAh ratings depending on how big the discharge current is. This means to get the figure of 3.2 amp hours, they discharged the battery at 0.65A for 3.2 / 0.65 = 4.92 hours. They obtained this number by discharging the battery at 0.65A discharge current. That's why you should always look at the discharge current they quote in the Notes section. Simply put, the more current you draw from your battery, the less mAh you'll be able to get out of it. That also means that if you want to do half that (1.6 amps) in an hour, then you would get two hours of power until the battery’s charge is depleted.īatteries operate under a rule known as Peukert's Law. This battery is rated at 3,200 mAh, meaning that in one hour, it can discharge 3,200 milliamps (3.2 amps) and then it’s done. If your battery has 1 amp hour, that means it can discharge 1 ampere of current over one hour, or half an ampere an hour for two hours, etc. (There are 1,000 milliamps to one amp.) Amps is a measure of current, so we know we’re dealing with how much ‘water’ is coming out of the pipe. This is just a measure of how long you can use your battery. ![]() Let’s dive in to a real li-ion battery spec sheet:įirst, let’s look at capacity. If the water comes out quickly ( high voltage) AND there's a lot of water ( high current), then you can put out a fire.Įlectrical power is like the ability of your firehose to put out a fire.If the water comes out quickly but there's very little water, then you can't put out a fire.If a lot of water comes out of the pipe but comes out slowly (no pressure), then you can't put out a fire.Imagine you're trying to put out a fire with a firehose. Why is this important? It tells us how much work we can actually do with the electricity. This is a measure of how ‘hard’ the water is coming out of the pipe. Think back to the water analogy: you’re taking the voltage, or the water pressure, and multiplying it by the current, or how much water is actually coming out. The math is super simple:Īnother important concept is electrical power. If you know any two of these numbers, you can calculate the third. Sometimes it’s called I, and this is France’s fault. Current is measured in amperes, amps or A. Current is how much water comes out of the pipe.When the pipe is smaller, there is more resistance. If the pipe is wider, more water will flow through. Resistance is the size of the lower pipe. ![]()
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