![]() for lithium battery it would be 100-265 Wh/kg or 250-670 Wh/L. So we can quickly get battery capacity(max capacity) based on battery energy density. They are on the shelf and therefore has short lead time and small MOQ. PS: quick notes: if space allows, cylindrical battery cells will always be your first consideration on the table. In cylindrical form there is capacity listed for each size: The lithium battery usually comes with a pouch or cylindrical form. Take 103450 battery cell for example (T=10mm, W=34mm, L=50mm) for a general calculation, we will set it to 0.1 K= mah/mm³, which is a parameter that ranges from 0.07-0.12. The actual capacity will be very complex, but luckily we have a simple and fast calculate formula. The material and Production technology will have an effect on the lipo cell capacity. If size are given or can be checked by a ruler, we can then get the battery capacity.The size of Lithium polymer battery has a great impact on its capacity, that’s the thickness, width, and length of a battery. We here have 2 ways for you to get the battery capaicty. 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). Lithium Battery Design Design Ebook Download(2M, 20 pages, PDF) Working time: 12V*60Ah*0.9/100W=6.48 H Want More Details: Download our battery design ebook. Quick Notes: 1A=1000mA (mA is current, mAh is Capacity) Thenĭischarging Time=Battery Capacity * Battery Volt*0.9 / Device Wattįor a 1800mAH 3.7v 18650 battery to power a 3.7V 10W digital device, how to calculate the running time?įor 3.7V 10W device,working current would be 10÷3.7 = 2.7027A = 2702.7 mA With 90% Power efficiency for Li-ion/LiPo batteries. What if you know Watts only, you will notice that every device use watt to determine it’s main specifications.ĭischarging Time=Battery Capacity*Battery Volt/Device Watt. We, therefore, will need to times 0.8-0.9 for the calculation: 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), that’s to say,your circuit will stop working at a set voltage before the battery is fully drained. So no more confusion on how to calculate battery life.įor a 18650 2500mAh(2.5Ah) battery with a device that draws 500mA(0.5A) you have: In other words, you can have “any time” as long as when you multiply it by the current, you get 10Ah (the battery capacity). ![]() Or if delivering 10A, it would last for only 1 hour, or if delivering 5A, it would last only for 2 hours. Throw away how long will a battery last calculator, and l et’s see an actual case, 10 Ah battery delivering 1A, would last 10 hours. ![]() So how to calculate how long a battery will last? If the capacity is given in amp-hours and current in amps, time will be in hours (charging or discharging). In the ideal/theoretical case, the time would be Time(H) = Capacity(Ah)/Current(A). ![]() 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.ġ How to Calculate the Run Time of a Specific Battery?ģ Battery Capacity Calculator (Instant Calculation Tool)ĥ How to convert Watts to Amps or Amps to Watts or Volts to Watts There are just too many questions you will wonder when designing your device with a battery inside it.
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