Notes

RC Battery & Charger</br>

<h1>RC LIPO BATTERY GUIDE: EXPLANATION, SAFETY, AND CARE</h1>


Without LiPo batteries, quadcopters as well as drones probably wouldn't exist.


Why?


Due to the fact that no other battery gives as much power while supplying high quantities of current in so small of a bundle. This indicates: longer flight times, much better ability to move, as well as faster flying. In other words, even more enjoyable.


Nevertheless, there is a lot of confusion regarding what terms suggest, just how to appropriately charge lithium polymer batteries, and also how to be safe when making use of batteries.


In this lipo battery guide, you'll obtain:


A comprehensive explanation of battery specs-- Nominal as well as cut-off voltage, capability, C-rating, internal resistance and even more

Exactly how to raise the life of your lipo battery

What to seek in a lipo battery charger

How to utilize a lipo battery charger

Why equilibrium charging is important

The distinction in between different sorts of battery adapters

Proper lipo battery safety as well as treatment

A glossary of typical lipo battery terms


So, let's begin with battery requirements.


<h2>Battery Voltage</h2>


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The first specification that most individuals check out when picking out a battery is the voltage. As stated in my write-up on motor Kv continuous, the rate of your electric motors is symmetrical to the voltage you supply to them so greater voltage batteries are capable of transforming electric motors quicker than reduced voltage batteries. The voltage of your battery will determine the kind of ESC's and also electric motors that you will require to use.


Lipo battery voltage is specified by the variety of cells in series. car battery charger - asda has a nominal voltage 3.7 V. Different battery companies note their lipos in different means but most individuals often tend to describe their batteries as ONE, TWO, THREE, etc


The adhering to voltage chart shows each battery designation and also the matching voltage.


1ST = 1 cell in series x 3.7 V = 3.7 V.

2S = 2 cells in collection x 3.7 V = 7.4 V.

TWO = 3 cells in collection x 3.7 V = 11.1 V.

FOUR = 4 cells in series x 3.7 V = 14.8 V.

5S = 5 cells in series x 3.7 V = 18.5 V.

SIX = 6 cells in series x 3.7 V = 22.2 V


You might additionally see lipos that use a letter &quot;P&quot; to mark voltage. For airplane tracker , 2S1P or 2S2P. This is not as typical with quadcopter batteries however you might see it with LiPo's implied for various other kinds of RC automobiles.


&quot; P&quot; means the number of cells in parallel. 2S1P means &quot;2 cells in collection and 1 cell in parallel.&quot; If a battery doesn't have a &quot;P&quot; after that it is thought to be &quot;1P.&quot; So 2S1P and 2S are the same thing.


3S2P suggests &quot;3 cells in collection and also 2 cells in parallel.&quot; This battery would have a total of 6 cells with 2 identical groups of cells with 3 cells in series in each of those teams.


<h2>Optimum Voltage as well as Cut-off Voltage.</h2>


Consider the 2 battery voltage curves in Figure 1. An &quot;suitable&quot; battery as well as an &quot;actual&quot; battery are shown. An excellent battery would certainly be capable of supplying constant voltage for the whole time it is discharging till it is completely released.


Real batteries do not act in this manner. Instead they begin at a higher voltage and after that their voltage will gradually lower as the battery is released.


So while an excellent battery could have a voltage of 3.7 V during the entire time it is releasing, a real battery will start at the maximum voltage of 4.2 V As it releases, maintain decreasing.


Just how far will it reduce? If you let it, it will fully discharge down to absolutely no volts.


Nevertheless:.


Battery manufacturers generally recommend you don't release your battery below a certain minimal voltage. This minimal voltage is called the cut-off voltage. Lots of producers recommend the cut-off voltage for lipos to be 3.0 Volts.


Almost talking, this implies you need to establish your voltage alarm system to something more than 3.0 V to ensure that you can securely land your quadcopter prior to it drops below 3.0 V Lots of people establish their alarms to 3.3 V.


<h2>Battery Capacity.</h2>


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Battery capacity is gauged in Amp-hrs or milliamp-hrs. It offers you an indication of the overall energy that a battery can save. In general, the greater the capacity, the longer your battery will last.


Making use of the gas storage tank example, a high capacity battery has a huge gas container that allows it to save a great deal of gas.


The most effective means to comprehend the capability of lipos is to consider exactly how it is determined. The basic procedure is to take a battery and also determine what constant present triggers the lipo to drop listed below the battery cut-off voltage in precisely 1 hr.


The capacity is after that just that existing times 1 hour.


So a 3000 mAh capability battery will certainly drop from full voltage to the cut-off voltage in 1 hr if you release the battery at 3000 mA (3 Amps). 3 Amps x 1 hour = 3 Amp-hrs = 3000 mAh.


There is one essential thing you require to note ...


The capacity of a battery lowers as the existing draw rises. This implies that if your ability is 3000 mAh for a continuous 3 Amp existing draw, after that your capability will certainly be less than 3000 mAh if you attract a continuous 6 Amps or a consistent 30 Amps.


I've seen a great deal of descriptions of ability that do not tell you this. You will certainly commonly see it written that if your battery's ability is 3000 mAh, then that suggests you can draw 3 Amps for 1 hr, 6 Amps for 30 mins, or 30 Amps for 6 minutes. Generally this is not the situation.


In order to tell exactly how present affects capacity, you require to consider a lipo battery discharge contours. A lot of good battery datasheets will certainly reveal various discharge curves for various consistent current attracts.


This number shows the discharge contour of an ONE, 1700 mAh, 35C battery (much more on what &quot;35C&quot; suggests later on). Each line represents a various constant current (42.5 A, 47.6 A, 51.0 A, and so on). This number reveals us that for a given cut off voltage the discharge ability decreases as the present draw goes up.


In this instance, for a cut off voltage of 3.0 V, the capacity at 1.7 A (1C) is 1700 mAh and I would approximate the ability at 42.5 A (25 C) to be about 1630 mAh as well as the ability at 68.0 A (40 C) to be regarding 1460 mAh.


So the 2 important points to bear in mind about ability are:.


Capacity tells you the quantity of current that the battery is capable of supplying for 1 hr.

If you discharge your battery at greater currents than that, your ability drops.


( Note that Amp-hrs is not a procedure of power. Energy is gauged in Watt-hrs. If you presume that the battery is discharging at consistent voltage, you might calculate energy from that. Nevertheless, as we learned in the previous section, batteries do not discharge at continuous voltage.).


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