RC Battery & Charger

Posted by Philipsen Saleh on May 31st, 2021

RC LIPO BATTERY GUIDE: EXPLANATION, SAFETY, AND CARE

Without LiPo batteries, quadcopters and also drones probably wouldn't exist. Why? Because nothing else battery gives as much power while providing high quantities of present in so little of a package. This means: longer flight times, better ability to move, as well as faster flying. To put it simply, more enjoyable. However, there is a lot of complication concerning what terms suggest, how to properly bill lithium polymer batteries, as well as how to be secure when using batteries. In this lipo battery guide, you'll get: An in-depth explanation of battery specifications-- Nominal and also cut-off voltage, ability, C-rating, internal resistance and also more How to raise the life of your lipo battery What to search for in a lipo battery charger Exactly how to use a lipo battery charger Why balance charging is necessary The difference between various kinds of battery connectors Correct lipo battery safety and security as well as care A glossary of typical lipo battery terms So, allow's begin with battery specs.

Battery Voltage

The first spec that many people take a look at when selecting a battery is the voltage. As pointed out in my short article on electric motor Kv consistent, the rate of your electric motors is proportional to the voltage you provide to them so greater voltage batteries can transforming electric motors faster than reduced voltage batteries. The voltage of your battery will certainly determine the kind of ESC's and electric motors that you will certainly require to make use of. Lipo battery voltage is specified by the variety of cells in series. Each cell has a small voltage 3.7 V. Different battery firms note their lipos in various means however many people often tend to describe their batteries as 1S, 2S, TWO, and so on The complying with voltage chart reveals each battery designation and also the matching voltage. 1S = 1 cell in series x 3.7 V = 3.7 V. TWO = 2 cells in collection x 3.7 V = 7.4 V. TWO = 3 cells in series x 3.7 V = 11.1 V. 4S = 4 cells in series x 3.7 V = 14.8 V. 5S = 5 cells in collection x 3.7 V = 18.5 V. 6S = 6 cells in collection x 3.7 V = 22.2 V You might likewise see lipos that make use of a letter "P" to designate voltage. For example, 2S1P or 2S2P. This is not as typical with quadcopter batteries however you may see it with LiPo's indicated for other kinds of RC lorries. " P" stands for the variety of cells in parallel. 2S1P implies "2 cells in collection and 1 cell in parallel." If a battery does not have a "P" then it is thought to be "1P." So 2S1P and 2S are the same thing. 3S2P implies "3 cells in series and also 2 cells in parallel." This battery would certainly have a total of 6 cells with 2 parallel groups of cells with 3 cells in series in each of those groups.

Optimum Voltage and Cut-off Voltage.

Think about the 2 battery voltage contours in Figure 1. An "perfect" battery and also an "actual" battery are revealed. A suitable battery would can supplying continuous voltage for the whole time it is discharging till it is entirely released. Real batteries don't act in this manner. Rather they start at a greater voltage and afterwards their voltage will gradually decrease as the battery is discharged. So while a suitable battery could have a voltage of 3.7 V throughout the entire time it is releasing, a real battery will begin at the maximum voltage of 4.2 V As it discharges, maintain decreasing. How much will it lower? If you let it, it will fully discharge to no volts. Nevertheless:. Battery producers generally recommend you do not release your battery below a certain minimum voltage. This minimal voltage is called the cut-off voltage. Lots of makers advise the cut-off voltage for lipos to be 3.0 Volts. Virtually speaking, this indicates you should establish your voltage alarm to something more than 3.0 V to ensure that you can securely land your quadcopter prior to it drops below 3.0 V Many individuals set their alarms to 3.3 V.

Battery Capacity.

Battery capability is measured in Amp-hrs or milliamp-hrs. It gives you an indicator of the total power that a battery can keep. In general, the greater the ability, the longer your battery will certainly last. Using the gas tank example, a high capacity battery has a big gas tank that permits it to keep a lot of gas. The very best means to comprehend the ability of lipos is to take into consideration just how it is measured. The basic treatment is to take a battery as well as figure out what continuous present creates the lipo to drop below the battery cut-off voltage in exactly 1 hour. Smart RC Battery Chargers is then simply that present times 1 hr. So a 3000 mAh capacity battery will certainly drop from complete voltage to the cut-off voltage in 1 hour if you discharge the battery at 3000 mA (3 Amps). 3 Amps x 1 hour = 3 Amp-hrs = 3000 mAh. There is one crucial thing you require to note ... The ability of a battery decreases as the current draw increases. This implies that if your capacity is 3000 mAh for a constant 3 Amp current draw, then your capacity will certainly be less than 3000 mAh if you attract a continuous 6 Amps or a continuous 30 Amps. I've seen a lot of descriptions of capacity that don't inform you this. You will frequently see it created that if your battery's capability is 3000 mAh, then that indicates you can attract 3 Amps for 1 hour, 6 Amps for 30 minutes, or 30 Amps for 6 minutes. As a whole this is not the situation. In order to inform just how current influences capability, you require to check out a lipo battery discharge curves. Most excellent battery datasheets will show various discharge curves for different constant current attracts. This number shows the discharge contour of a 1S, 1700 mAh, 35C battery (a lot more on what "35C" suggests later on). Each line stands for a different continuous current (42.5 A, 47.6 A, 51.0 A, and so on). This number reveals us that for a provided cut off voltage the discharge capacity lowers as the present draw rises. In this example, for a removed voltage of 3.0 V, the capability at 1.7 A (1C) is 1700 mAh and I would approximate the capacity at 42.5 A (25 C) to be about 1630 mAh and also the capacity at 68.0 A (40 C) to be regarding 1460 mAh. So the 2 vital things to remember concerning capacity are:. Capacity informs you the quantity of current that the battery can supplying for 1 hr. If you release your battery at greater currents than that, your capacity drops. ( Note that Amp-hrs is not a measure of power. Energy is determined in Watt-hrs. If you think that the battery is discharging at continuous voltage, you can determine power from that. Nonetheless, as we discovered in the previous section, batteries do not discharge at constant voltage.).

Like it? Share it!

About the Author

Philipsen Saleh
Joined: May 12th, 2021
Articles Posted: 4