Laptop battery life calculator
How To Calculate Battery Run TimeThere are just too many questions you will wonder when designing your device with a battery inside it. Show The boss just want a cheap and small battery with it, but with no further information on how long does the end customer wants, how small can it be. in this article, we will show you: 1 How to Calculate the Run Time of a Specific Battery? Ready for your battery design? In the ideal/theoretical case, the time would be Time(H) = Capacity(Ah)/Current(A). If the capacity is given in amp-hours and current in amps, time will be in hours (charging or discharging). Feel Confused ? So how to calculate how long a battery will last? Throw away how long will a battery last calculator, and lets see an actual case, 10 Ah battery delivering 1A, would last 10 hours. Or if delivering 10A, it would last for only 1 hour, or if delivering 5A, it would last only for 2 hours. In other words, you can have any time as long as when you multiply it by the current, you get 10Ah (the battery capacity). It is that simple. so no more confusion on how to calculate battery life. For a 18650 2500mAh(2.5Ah) battery with a device that draws 500mA(0.5A) you have: 2.5Ah/0.5A=5 Hours Please take note that most batteries, especially those with circuits, will not work down to 0 Volts as a power supply (if it goes to zero, it will have shorter battery life, or even become dead battery if not charged in time), thats to say,your circuit will stop working at a set voltage before the battery is fully drained. see below dischaging chart it will not go to zero(totally empty) We, therefore, will need to times 0.8-0.9 for the calculation: thats 2.5Ah/0.5A*0.9=4.5 Hours What if you know Watts only, you will notice that every device use watt to determine its main specifications. 5 Watt bulb, 20W Laptop, 100W Motor, 200W Solar Street Light Just name a few. In Theory, thats: Discharging Time=Battery Capacity*Battery Volt/Device Watt. Say, 5AH*3.7V/10 Watts = 1.85 hrs With 90% Power efficiency for Li-ion/LiPo batteries. Then 5Ah*3.7V*0.9/10W = 1.66 hours Lets 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? for 3.7V 10W device,working current would be 10÷3.7 = 2.7027A = 2702.7 mA Quick Notes: 1A=1000mA (mA is current, mAh is Capacity) Or you can use 3.7V*1.8Ah(1800mAh)*0.9/10W=0.599h=36min Another example: 12V 60Ah battery pack to power 220V 100W light How to Calculate Battery Capacity ?Things would be quite complicated as the battery would be in different shape(Curved shape, Round,Rectangular etc ) and different discharging current(5C, 30C, or even up to 100C) or even temperature requirement(like low temperature battery). feel frustrated? We here have 2 ways for you to get the battery capaicty. lets start from simple ways Capacity= Thickness*Width*Length*K K= mah/mm³, which is a parameter that ranges from 0.07-0.12. for a general calculation, we will set it to 0.1 take 103450 battery cell for example (T=10mm, W=34mm, L=50mm) what about 603450(also called 063450 603450LP)? 2 Get Battery Capacity by Energy Density The lithium battery usually comes with a pouch or cylindrical form. in cylindrical form there is capacity listed for each size: like for lithium 18650 battery: 2000mAh, 2600mAh,3000mAh, 3350mAh,4050mAh for lifepo4 26650 battery:2500mAh, 3000mAh,3500mAh PS: quick notes: if space allows, cylindrical battery cells will always be your first consideration on the table. They are on the shelf and therefore has short lead time and small MOQ. so we can quickly get battery capacity(max capacity) based on battery energy density. for lithium battery it would be 100-265 Wh/kg or 250-670 Wh/L. Energy Density of Different Battery Types Lets say what would be the battery capacity at 11.1V 7kgs it would be 7kgs*265 wh/kgs=1855Wh so thats 1855 Wh/ 11.1V=167Ah Impotant note: above are max capacity as there is BMS and wiring cables included for a battery pack. Online Size Battery Capacity Calculatorcapacity less than 500-2000mAh Thickness (mm) Width (mm) Length (mm) Capacity (mAh) capacity from 2000mah to 10000mAh Thickness (mm) Width (mm) Length (mm) Capacity (mAh) Remarks: 1 the calculator does not apply to capacity less than 500mAh or 2mm less in thickness cells Battery Run Time CalculatorHow long will my battery run, this is a big question for many end users and even for some electronics engineer. We here come with a simple battery time calculator that will tell you how long your battery will run. Battery Run Time= Battery Capacity in mAh / Load Current in mA Lets see one real example How long will a 2000mAh battery last for a 100mA current cell phone its 2000mAh/100mA= 20 Hours Important: Dont mess mAh and Ah , 1Ah=1000mAh for a 500mAh battery, that runs at 0.1Ah device,thats 0.5Ah/0.1Ah Or 500mAh/100mAh= 5 Hour if the battery has Wh information on it, convert it to mAh Convert Watts to Amps Some customers asks for 12v battery run time calculator, Actully the formula works for all volts. Lets say a 12V 100Ah solar lithium battery to be used for a 12V 30A device Here we come some key important take aways 1 when you convert the battery with the same volt and same Ah or mAh, you can use the fomula and just ingore the volt How to convert Watts to Amps or Amps to Watts or Volts to Watts?You cannot convert watts to amps, HOWEVER, if you have at least two of the following three: amps, volts or watts then the missing one can be calculated. The Following Equations can be used to convert between amps, volts, and watts. Convert Watts to Amps Converting Watts to Amps Converting Amps to Watts Converting Watts to Volts Converting Volts to Watts Converting Volts to Amps at a fixed wattage Converting Amps to Volts at a fixed wattage Related Lithium Battery Packs18650 Lithium Battery Pack GPS Battery Pack Rechargeable Li-Polymer Battery CCTV Battery Pack Ebike Lithium Battery Laptop Power Bank 12V Lithium Battery Pack 48V Battery Pack Summary Rating Aggregate Rating 4.5 based on 76 votes Brand Name DNK |