![]() A resting voltage of 3.7v should get you right there, but if you have way of measuring mAh consumption via a current sensor, it will be much more reliable than relying on voltage alone, as voltage can fluctuate dramatically depending on the current draw load on the battery and the quality of the cells.Īnother thing to be aware of is as your battery ages, the useful capacity of the cells, as well as the safe current draw, can reduce fairly dramatically. You don't want to use much more than about 80-85% of the overall mAh capcity of the battery. You typically won't want to draw your battery much below about 3.3-3.5v per cell under load, and it should recover to around 3.7v resting with no load. Regardless, the number you get will be a good value to use when estimating functional capacity for flight time estimates. ![]() It's not 100% accurate, but it's a safe ball-park. Your charger should tell you how many mAh were put back into the pack, and you can typically multiply this by about 1.2 to get an estimate of the total mAh available in the pack. If there is no label printed with mAh capacity, or you don't trust the stated mAh, you can discharge the battery till the resting voltage is about 3.7 volts per cell under no draw, and then charge it back. Even if there is no label on the battery, the mAh rating is typically printed on the side of the cells. For Lipo batteries typically used in drones, the stated mAh is usually a fairly decent estimate of the actual, though that varies some depending on the brand and quality of the battery supplier and the current load and age of the battery. The mAh rating should be written on the battery. I hope this gives you the right pointers on where to start. Very difficult to find tests because the batches of batteries even from the same vendor have different performance characteristics. There is some websites and youtube channels doing battery tests, only if you test a cell you can know exactly how it performs. check your datasheet of the battery for this(if your battery has no datasheet then the only option is measuring). Stated capacities on batteries are estimnates at best, depending on battery type it can be the most achivable mAh or the minimum value which is always achived. The way to be sure is to measure when you charge or discharge. The specific mAh you can get from a battery depends on the voltage difference from charged to discharged state you are willing to use and at what current you do it (careful it can be dangerous or damaging to discharge to low or charge to high as well as overdrawing current). If you want to learn about batteries and their characteristics, you should probably go to the BatteryUniversity to learn a few things before you start to do calculations, because if you miss interpret stated parameters as facts, you will get wrong results.
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