Note that there are battery run-time calculators on the web that are very wrong. All Rights Reserved. A LiPo battery consists of multipe cells. All calculations for efficiency loss will be done no matter which value you are trying to calculate. For the Yes part, for battery packs that draw working current less than 5A (like power banks), you can calculate the cost by about 1.5 USD/2.6Ah Chinese 18650 battery cell, 2USD/2.6Ah Korea cells. If not, then it can be measured as; Volts x ampere hours (Ah) = Watt hours Example 1: A 4,400 mAh 11.1 volt battery Divide the mAh rating by 1,000 first to get an Ah rating of 4,400/1,000 - 4.4ah. If not, you can calculate it as Volts x amp hours (Ah). As a point of reference, the average refrigerator uses 500 kWh per year or 50kWh per month and 5000 kWh would be equal to five hundred thousand watt-hours. by using the watts formula, you can check and calculate the accurate electric measurements of your tool. Not all brands say something about the peak discharge rate on the battery itself. Different types of batteries work at a specific voltage, so comparing them only by amp hours can lead to misleading conclusions. Whether you have a 2200mAh 2S pack or 10S pack, if you draw 50A it'll theoretically last 2.64 minutes. (c) 2012 multicopter.forestblue.nl. Hence, the final version of the battery capacity formula looks like this: E = V Q, where: E - Energy stored in a battery, expressed in watt-hours; V - Voltage of the battery; and Q - Battery capacity, measured in amp-hours. Example: Calculate the flight time, current drawn from the LiPo battery of your quadcopter and other important characteristics for your quadcopter, battery charger specifications if the maximum current per motor is 10 amps, maximum current drawn by other copter equipment is 2 amps; your drone uses a 5000 mAh 7.4 V 30C LiPo battery and the . For example, if a gadget uses a 2500 mAh battery, a 10000 mah battery will last roughly 4 hours. Most of the time the Amp and the hour have already been multiplied so the equation is just Volts times Amp hour equals Watt hour. Using a colon is . hours. Most people read time using either a 12-hour clock or a 24-hour clock. Watt-hours = milliamp-hours x Volts / 1000, which means that the watt-hours are calculated by multiplying the number of milliamp-hours by the volts then dividing the result by 1000. You can convert Watt-hours to Amp-hours by dividing by the . A drawn by other equipment (lights etc.) For information on how this calculator works see How to calculate the Watt Hours (Wh) of a lithium battery. One kilowatt-hour is equal to 1000 watt-hours, so in order to convert watts to kilowatt hours, you need to divide the result by 1000: If you use other units of energy, i.e., mechanical horsepower, try our power converter to convert them into watts. Welcome to our watt-hour calculator, which allows you to convert electric charge in milliamp hours to watt-hours expressing the electrical energy transfer (power) of the system. Watts to Wh calculator Enter the power in watts (W), time period in hours (h), then press the Calculate button to get the result in watt-hours (Wh). The amount of cells only determine the voltage (V) of your LiPo, as needed for your equipment. Example: A 12-volt battery rated to 8 Amp. Other chemistries, such as LiFe & LiMh batteries will be different. So we have 14.8V x 2.2Ah = 32,56 Wh. There are ohms calculators online you can use and you only need to enter two values and it figures out the rest for you also there is an app that you can use where you pick out every detail of the build (they show you photos of coils and you touch the one you made) what gauge how many wraps etc. The calculator will calculate the battery life if the Watt Hour and the battery voltage is known. And then of course there's using a meter. So, if you have 100 watts running over four hours that equals 400 WHs (100400). Should I upgrade to a Gel Battery for my trolling motor? Therefore 10 lights will be 456 Watts total per hour. Then Discharging Time=Battery Capacity * Battery Volt*0.9 / Device Watt 5Ah*3.7V*0.9/10W = 1.66 hours Let's explain with more examples: for a 1800mAH 3.7v 18650 battery to power a 3.7V 10W digital device, how to calculate the running time? amps = volts / ohms. This advanced online Battery Charge Time Calculation tool is used to calculate the maximum charge time of batteries, based on the entered information. Example 1: Must calculate the watt-hour capacity of a car battery having a voltage of 12 volts and capacity of 60Ah. Converting amp hours to watt hours makes it easier to compare how much energy different batteries can deliver. This will warn you when the battery is drained before it's fully empty (20%). The higher voltage means that more electricity can flow in an electric device. If your lithium battery does not include a watt hour (Wh) rating on the casing you can calculate it by using the voltage and mAh or Ah capacity. Calculate power in watthours from milliamp hour. 456 Watts will pull ~41 amps from a 12v battery . amps = watts / ohms. Multiply these two numbers to get the watt-hour rating (Ah V = Wh). Therefore, you can use our converter to calculate electric capacity in watt-hours for each battery and compare them. Apart from the cells, a discharge rate is defined by the letter 'C'. They don't like to get discharged to the bottom. So we calculate the power capacity as Volts times Amps times hours equals capacity in Watt-Hours. In other words, one watt-hour equals one watt of average power flow over an hour. If we talk about the Ampere, it is an electrical unit that used to calculate the actual flow towards the heap. How much Current is my Brushless RC Car Motor Going to Draw? The simplest formula is : I = Cr * Er or Cr = I / Er Where Er = rated energy stored in Ah (rated capacity of the battery given by the manufacturer) I = current of charge or discharge in Amperes (A) Cr = C-rate of the battery Equation to get the time of charge or charge or discharge "t" according to current and rated capacity is : t = Er / I Fill out the remaining boxs for the 2nd battery pack and then hit the submit button. This page is a quick run-time calculator to help you estimate the run-time based on simple assumptions. These cells deliver approx. The table displays calculations based on the information given. The battery's capacity is defined in mAh. Your output will be displayed. The key is to use the watts you know to calculate the amps at the battery voltage. A 3S 2200maH 40C LiPo pack will get you this: Q (mAh) = 1000 E (Wh) / V (V). The first step in figuring out how many solar panels you need and what size of off-grid solar power system will work for you, is to know how much energy you use on a daily basis. 50Ah in watt-hours = 50Ah x 12 volts = 600 watt-hours. 0.05C is the so-called C-rate, used to measure charge and discharge current. Sometimes you can conclude that a battery with higher amp hours can provide much more energy, but you should always take into account the nominal voltage at which the battery is operating. plus 20%-30% cost (PCM and assembly cost ) For the No part, for battery packs that is quite thin (less than 18mm) or require high discharge current . 1/12 * 500 = 42 watt hours + 5.5*24 = 174 watt hours. This quick and intuitive watt-hour calculator is a tool that allows you to convert electric charge in milliamp or amp hours to watt-hours describing energy. Here's the equation: (total number of watts) x (total number of hours) = watt-hours. 12-hour clock: A 12-hour clock uses the numbers 1-12. If you need it our Lithium battery watt hour calculator will work out your results for you. For comparison, laptop batteries have energy output in the range from 22 Wh to nearly 100 Wh, depending on brand and type. How to Calculate Work Hours. The power produced by the 10S pack will be 2100W. So, a 2200mAh / 40C LiPo can only handle an Ampre draw of 88A at max. Easy enough! ), which means that the energy in Kilowatt-hours is calculated by multiplying the power in Kilowatts by the time in hours. E bat is the watt-hours of rated energy stored in the battery., V bat is the battery's rated voltage in volts, and. However, when you calculate the battery capacity of 100Ah and get 1,200Wh, you can quickly figure out how long the battery will last: You have a 1,200Wh battery. Using the inverter calculator, indicates ~14.35 Amps DC load and then running the sizing calculator suggests that I need battery capacity of 306 . This calculator will tell you how long your battery will run. Time = 2.2/50 x 60. youDesign by Free CSS Templates. Number of motor (s): Maximum current (A) needed per motor: Max. RC Charger Wattage Calculator Required Charger Wattage - RC Charger Wattage Calculator Enter the battery capacity in mAh Select other Parameters and then click Calculate! This applies to lithium metal batteries (disposable) and lithium ion batteries (rechargeable). For example, If the power in kilowatts is 50 (kW) and the time in hours is 11 (hrs. You can also use; (Wh) = mAh x V / 1000 which abbreviates the formula utilized by the calculator in executing the conversions from milliamp-hours to watt-hours. This applies to lithium metal batteries (disposable) and lithium ion batteries (rechargeable). You can use the numbers printed on a battery to calculate a number for its capacity in Wh if its not already there. The equation is simple. You can also calculate watt-hours by entering the power of the device and the time period in hours directly. This calculator will tell you what battery size you need. For milliamp hours (mAh), divide by 1000 (to get to Ah) and then multiply by the Volts. Battery specifications are at C5 Rating How to calculate the Watt Hours (Wh) of a lithium battery, How to calculate the lithium content of a lithium battery, VIDEO What makes a deep cycle battery different. To determine watt hours (Wh), multiply the volts (V) by the ampere hours (Ah). Do you want to know how to calculate the power consumed by your electrical devices? If you intend to ship or you are traveling by air with lithium cells, batteries or battery packs, you will need to know their Watt-hour rating. So, if you have a 60W bulb and you're trying to calculate how many watts your bulb uses in 24 hours, your equation would read 60 watts x 24 hours = 1440 watt-hours. Overcharging can cause your LiPo to catch fire and burn your belongings to Kingdom Come. Selected flying load will help you define the maximum flying time based on selected mAh capacity. For NiFe, for example, using Solar this could typically be <65% of the Ah rating for 4~6 hours. Example: Calculate the maximum time taken by a battery to charge by the given details. The power produced by the 2S pack will be 370W. Voltage. You can now calculate as - 4.4Ah x 11.1 volts = 48.8Wh example 2: a 12 volt 50 Ah battery - 50 Ah x 12 volts = 600Wh If you need it our Lithium battery watt hour calculator will work out your results for you. This fact is very important to keep in mind, when choosing a LiPo battery. Select a 2nd battery pack cell count if you want to check your wiring of two different packs. Move the sliders according to your setup. Formula: watt hours = watts hours Abbreviated: Wh = W hrs Example For example, let's say you have a 50-watt fan, and you leave it on for 3 hours one night. You can convert Watt-hours to Amp-hours by dividing by the battery's nominal voltage (V) as follows: Ah = Wh / V +More Battery Life Battery Capacity Device Consumption Battery Life Formula TIME FORMAT: Estimated Battery Life: *Based on ideal conditions. Amp hours the shortened name of ampere-hour indicates how much charge can flow through a battery per one hour. To calculate the relationship between charge in amp hours and voltage in volts, the formula should be used: 1 amp hour is equal to 1000 milliamp hours, so if you want to convert watts to kilowatt-hours you can simply divide the result by 1000: Let's say you have a lithium-ion polymer battery that has 1200 mAh and a nominal voltage of 3.7 V. When we use our converter, we can directly calculate the energy of the battery in watt-hours: In this example, your battery has a capacity of 4.44 Wh. The minimum need is based on the maximum needed current (Ampre) drawn from the LiPo. Step 2. Power consumption (Watt) is not really a factor for choosing your LiPo. The Ultimate Off Grid Solar Power Calculator - Figure out how much solar you need. Needed voltage amount (3.7V steps): MaH select: For information on how this calculator works see How to calculate the Watt Hours (Wh) of a lithium battery. Adjust flying load according to your wishes. So milliamp-hours is equal to 1000 times watt-hours divided by volts: When we convert amp hours to watt-hours we can better estimate how much energy can be delivered by different batteries. Note: If the capacity of your battery is expressed in milliampere hours (mAh)like in the image above you will need to divide by 1,000 to calculate the ampere-hours (Ah) before multiplying. Average run cycle is 10 hours. Max. :: Events :: News, Details & Links. View example. Actually, watts is the fundamental unit of power and watt-hours is the energy stored. Normally the watt hours of battery is stated on the battery itself. You can measure the amount of energy you consume with two simple tools: a Kill-A-Watt meter and a clock. Just specify: Our watt hour calculator allows you to use electric charge in milliamp or amp hours and voltage in volts to calculate the energy in watt-hours or joules. is rated at 96 watt hours (12 x 8 = 96). LiPo Calculator for multicopter Move the sliders according to your setup. mAh means milli-Ampere per hour. Why Convert Amp Hours to Watt Hours? See total work hours in hours and minutes hh:mm format as well as decimal hours. You can only change the RED cells. The battery's nominal voltage (V); and its capacity in ampere-hours (Ah). More specifically, it is an electric charge in a battery that enables 1 ampere of current to flow for one hour. Here's how to calculate its total energy consumption in watt hours: 50 W 3 hrs = 150 Wh So the fan's total energy consumption that night was 150 watt hours. This battery life calculator estimates how long a battery will last, based on nominal battery capacity and the average current that a load is drawing from it. . However.. For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. If you want to calculate watt hours over a period of time t in hours, you can simply multiply: Therefore, one watt over six hours would be six watt-hours of power. For Watt-Hours/Day, please use our kWh Calculator. If you don't know, leave it on the default 30%, which is quite normal. C alculator default set to 1x 10.24kWh NiFePo4 Battery! There are also 24 hours in a day. You have to divide your LiPo pack capacity (mAh) by 1000 in order to convert from mA to A. Example 3: Must calculate the voltage of a battery having 80mAh and 288mWh. You come the right place here, below are general chart of cell and lipo battery pack, include capacity, demesions, Voltages, discharge rate, weight, width, height, height, Configuration etc. Check out 87 similar electromagnetism calculators , Acceleration of a particle in an electric field, Milliamp hours to watt-hours an example. Or, to use the abbreviated measurement, the answer would be 1440Wh. Watt hours are calculated by multiplying the volts by the Amp-hours. Insert milliamp hour (mAh) and voltage (V) and click on Calculate to obtain Watt hours (Wh). How do you calculate watt-hours? = 2.64 minutes. This applies to lithium metal batteries (disposable) and lithium ion batteries (rechargeable). Here is the formula Battery Life = Watt Hours / ( Voltage x Current in Ampere) You may also like to check Watt Hour Vs Ampere Hour if the battery capacity has been defined as Watt Hour. Most batteries cases say something like "25C to 40C" discharge rate. This means that 25C is the nominal discharge rate and 40C is the maximum burst discharge rate. For standard AA or AAA batteries, you do not need to use amp hours, as their rating is provided in milliampere-hours (mAh). Appliance draws 400W. Enter your capacity Amp-Hours and your discharge in Amps in the form below and press the "Compute" button . This online time clock uses a standard 12-hour work clock with am and pm or a 24-hour clock for military time. milliamp-hours to watt-hours calculation The energy E(Wh) in watt-hours is equal to the electric charge Q(mAh) in milliamp-hours times the voltage V(V) in volts (V) divided by 1000: E(Wh) = Q(mAh) V(V) / 1000 So watt-hours is equal to milliamp-hours times volts divided by 1000: watt-hours = milliamp-hours volts / 1000 or Wh = mAh V / 1000 If your lithium battery does not include a watt hour (Wh) rating on the casing you can calculate it by using the voltage and mAh or Ah capacity. Most LiPo vendors will tell you what the maximum charge rate of the battery is. C bat is the battery's rated capacity in Ah. A 36-volt 10-Ah battery pack has 360 watt hours (36 X 10 = 360). Therefore a 360 watt hour pack will get you about 18 miles. The power and configuration calculator has been created to assist models in making sure they have all the information they require to purchase application matching battery packs. Convert mAh to Watt hours. The following formula is used to calculate the Rated Energy in watt-hours contained in a battery: E bat = V bat * C bat E bat = 11.4V * 2200mAh = 25.08 W h. Where. The battery capacity, together with the LiPo battery's discharge rate will define its maximum current output (Ampre, A). If you want to determine what is a watt-hour, it is the total amount of generated or consumed energy over a period of time (an hour). An hour is most commonly defined as a period of time equal to 60 minutes, where a minute is equal to 60 seconds, and a second has a rigorous scientific definition. Therefore, a LiPo warner will let you know when voltage levels become lower then 20%. = 550 Kilowatt-hours. Watt Hour to Amp Hour Conversion Calculator Amp Hour to Watt Hour Conversion Calculator This calculator converts a battery or battery packs Watt hours (Wh) rating into its Amp Hours rating. Flying load is based on type of flying and/or weight of the copter. Number Conversion Decimal Fraction Conversion Temperature Conversion Weight Conversion Knowing the hour rate of your battery, its . VIDEO How a zinc-carbon battery is made, VIDEO How an alkaline based battery is made, VIDEO How a nickel based battery is made. RC LiPo Charger and Power Supply Calculator Watch on Max Charge Rate due to Power Supply Wattage Enter the battery capacity in mAh and Charger Wattage in watts. The calculator will calculate the missing value of the first three entries; one must be left blank. To use theRC LiPo Battery Power & Configuration Calculator, simply use the drop down boxs to select your battery pack specifications. For example, if you have a 300mAh battery rated at 5V, the power is 300mAh * 5V . This is usually stated on the battery itself (see Image 1). It's important to know that the battery cells don't count up for maximum current draw. This results in 5000mAh/1000 = 5 Ah. E = V I T Hopefully, you remember that amp hours are a measure of electric charge Q (the battery capacity). The same battery discharged at 0.5C provides 500mA for two hours. A battery with a 1000mAh capacity can deliver 1 Ampere (1000mA/1000) for 1 hour. For more on that, I suggest to read the manual or ask your supplier. To use our tool, you only need to go through a few steps: You can also convert watts to kilowatt-hours. Load Voltage (Vdc) Duration (hours) Remaining charge (%) Cable size calculator AS/NZS 3008 Wire size calculator NEC Maximum demand calculator AS/NZS 3000 Parameters Load type (ampere or watt): Select the unit in which the load will be specified, ampere or watt. View example. Hi FolksI have people asking me a lot of questions about chargers and which should they get and why they need a high watt charger when the lower watt charger. Example 2: Must calculate the ampere-hours of a battery to have 100 watt-hour capacity at 7.2 volts. It's advisable to stay on or below nominal discharge level to preserve battery future life. If you want to further convert watt-hours to joules, you can also try another of our calculators, namely the energy conversion calculator. As we told earlier, the safest charge rate for LiPo batteries is 1C. On the other hand, voltage is expressed in volts (V) and describes the "pressure" that causes electricity to flow within a circuit. AMPS = WATTS / VOLTS Using this formula allows us to figure out a charger's maximum amperage capability for batteries of different sizes. For Monthly kWh, check your monthly kilowatt-hour usage printed on your electric bills. And a 2C charge rate would be of this double or 10 A. A 100Ah battery will run a fully-loaded 100 watt inverter for = 600 / 1000/ 0.95 = 0.63 hours. V. But it is for choosing the right cabling. t = 1/Cr to view in hours or to view in minutes use time = 60mins / Cr (c rating) Examples of Different C Rating Calculations Easy! mAh to Wh calculator Watt-hours to milliamp-hours calculation formula. amps = watts / volts. Looking at the figures I would go up to 16AH/day for the inverter. ( read our article on calculating range) Once you get to 1000 watt hours, its called one-kilowatt-hour, and that's how electric car packs are measured. Possibly 20AH for . Not only are Watt Hours a good unit of measurement for capacity, but it is also pretty universal when . With 90% Power efficiency for Li-ion/LiPo batteries. Solution E (kWh) = 50 (kW) x 11 (hr.) A constant current draw of 20A from a 2200mAh LiPo will get you:( 2200mAh /1000) / 20A = 0.11 x 60 = 6.6 minutes flying time. So a 36 volt 10-Ah pack has 360 watt hours and a 52V 10-Ah pack has 520 watt hours. The formula for calculating watt-hours is Watts x Hours = Wh. The Amp hour rating can be useful to know when purchasing new batteries that are rated on Amp hours. Calculate total work hours with lunch and breaks. ), what will be the energy in Kilowatt hours? To use the RC LiPo Battery Power & Configuration Calculator, simply use the drop down box's to select your battery pack specifications. The 80% rule is commonly used in LiPo calculations. Dec 20, 2013, 02:17 AM. 174/12 = 14.5AH/day. Battery 2 C Rating for Continuous Discharge, RC LiPo Battery Power & Configuration Calculator, RC Drone Max Distance and Maximum Flight time Calculator, Brushless Motor Kv Measure a Motors Kv, Understanding Electricity For RC vehicles, Measuring Electricity Voltage, Current, Power, RC Electric Boats Guide for Successful Electric Boating, RC Sailboat Controls Radio Layout, Radio Setup, LEGO Passenger Train Converted to RC using RC Hobby Grade Components ( Full Proportional control ). An example of this would be that the Yeti 400 contains a 33 Amp Hour battery operating at 12 Volts. Lithium-Iron (LiFePo4) Battery Calculator Ah to kWh Battery Charge or Discharge. not 23w. Battery capacity is typically measured in Amp-hours (Ah) or milliamp-hours (mAh), although Watt-hours (Wh) is occasionally used. See also: Air travel with lithium batteries Shipping lithium batteries How to calculate the lithium content of a lithium battery 1 kWh = 1000 Wh. Watt-hours = watts * hours = 250 watts * 5 hours = 1250 watt hours However, like watts calculator, watts, amps, volts calculator is available in the market to provide the electric detail and the tool's power consumption. If you are nitty with your energy usage, each mile you travel will cost you about 20 watt hours. Capacity (Amp-hours) . Please use a special build LiPo battery charger and NO OTHER! A 4S LiPo would therefore supply 14.8V. Say, 1200Ah x 48V 1000 Watts =12 hrs (with 40% loss at the max = 48x401000 =1.92 hrs). Adjust flying load according to your wishes. V. Wh. Fill out the remaining box's for the 2nd battery pack and then hit the submit button. The Electricity Retailers dirty secrets they don't want people to know: How to make the Electricity Retailers Redundant! You may need to know the watt hour (Wh) rating of a lithium battery to determine how it should be shipped or to ensure you conform to regulations regarding air travel with lithium batteries. 12 Volts x 33 Amp Hours = 396 Watt Hours or roughly 400 Wh. In short, a 100Ah 12V battery will run a 400W appliance for 3 hours. 3.7 Volts. Solution: Apply formula: No matter how big or how small, the first step is always calculating how many watts . How Do You Calculate Lithium Ion Battery Watt Hours? Don't push the LiPo. So, a 4000mAh LiPo can be charged at a maximum rate of 4000mAh / 1000 = 4A. The charge time depends on the battery chemistry and the charge current. E (kWh) = P (kW) x t (hr. Voltage is typically fixed for different types of batteries and depends on type of internal chemistry (alkaline, lead acid, lithium, etc. A discharge of 1C draws a current equal to the rated capacity. The table displays calculations based on the information given. By measuring the amount of instantaneous power consumed by an appliance and multiplying that by time in use, you can calculate the total electric charge. Don't get those cables burned out by using choosing cables too thin. Calculating the Energy To Increase Your Run-Time: Add more batteries and/or increase battery voltage from 12V to 24V. First, recall the voltages of various size LiPo batteries: 2 cell LiPo = 8.4V max 3 cell LiPo = 12.6V max 4 cell LiPo = 16.8V max 6 cell LiPo = 25.2V max 2200mAh x 40C = 88.000 mAh discharge rate mAh. The equivalent of 10000 mah is around 3.7 watt-hours or 3.7 amp-hours. Amp-hour calculation: 10: Total watts Daily requirements Watt-Hrs d-1: 11: Corrected for battery losses Assumes static average loss Watt-Hrs d-1: 12: System voltage DC voltage only: . A drawn by other equipment (lights etc.). RC Lipo Battery. Convert Ah to watts: 12 volt deep-cycle lead-acid available capacity = 100Ah x 50% = 50Ah. This Off-Grid Solar System Sizing Calculator helps you size the battery bank, Watts of solar power, and charge controller you need for an off-grid solar system. Preferably, always use a LiPo low battery warner on your RC device. If not, keep in mind a maximum charge rate of 1C. It's not good for you LiPo to drain it completely. How fast can a Sealed Lead Acid rechargeable battery charge? 1.Introduction of lipo battery charge time calculator The battery life is determined dependent on the present rating in i.Milliampere (mA) ii.Milliampere Hours (mAh) The mAh is the final limit of the battery. How to calculate the Watt Hours (Wh) of a lithium battery, Peukerts Law how long an amp hour battery will last under a given load, VIDEO How a zinc-carbon battery is made, VIDEO How an alkaline based battery is made, VIDEO How a nickel based battery is made, VIDEO What makes a deep cycle battery different. You simply divide 1,200Wh by 400W and get 3 hours. Please notice that current draw depends on your way of flying and external factors such as resistance, weight and wind. 88.000 mAh / 1000 = 88 Ampere constant discharge rate. Here is an example, which can be a Read more "Lipo Battery Size Chart: Dimensions . Watts to Wh calculation Power in watts (W) Time period in hours E(Wh) = P(W) t(h) The energy E in watt-hours (Wh) is equal to the power P in watts (W), multiplied by the time period t in hours (h). Watt Hours are calculated using a similar equation when dealing with batteries. Run-Time Calculator Assumptions Batteries are 100% charged to start and will only draw down to 50% - lead acid batteries only. Enter numbers such as 1215 for 12:15 or 137 for 1:37. And you won't like your multicopter falling down from the sky suddenly either. For example, a battery rated at 1000mAh provides 1000mA for one hour if discharged at 1C rate. A 400 Watt inverter will struggle with this power. Battery Capacity (mAh) = 25 Charge Rate Current (mA) = 30. Or 1mA for 1000 hours. Select a 2nd battery pack cell count if you want to check your wiring of two different packs. It may be used to calculate the run duration of devices that demand a certain amount of watts or amps. 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