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What Is Good Internal Resistance Of LiPo Battery
The researchers and scientists created the lithium polymer batteries to overcome the limitation of lithium-ion batteries. However, these batteries have their own set of limitations. The LiPo batteries suffer from voltage sag and some other properties during the discharge cycle that can be explained by Ohm's law. Hence, the only possible explanation for such behavior of the lithium polymer battery pack is the internal resistance present in it.
It is a property that exists in all substances that conduct electricity. Hence, you can never get rid of the internal resistance entirely. And the bad thing is that this property affects the efficiency of the battery pack preventing the complete flow of power. The higher amount of IR means that the battery pack will be less efficient and provide less current.
To calculate the total internal resistance of a battery pack, you can add the individual cell resistance numbers together. According to Ohm's law, the internal resistance of a cell is calculated as,
When you have timed reading of IR, the chart will serve as a reference to tell you that it is time to retire the LiPo battery.
How Much LiPo Internal Resistance Is OK?
If someone asks you this question, then there is no right answer. The lower amount of internal resistance depends on the individual circuit. Suppose you have a typical battery pack of 1300 to 1500 mAh capacity. For that much capacity, the internal resistance of the circuit should be lower than 10 to 15 m Ohm. Once the battery starts to get old, the internal resistance will rise to 15 to 20 m Ohm. And once the level goes above 20 m Ohm, it is time that you retire the battery and replaces it with another one.
So, if you ever have to ask is your battery safe for use, then you must replace it as soon as possible. And even if you don’t have the means to measure the internal resistance specifically, you will experience a change of performance in the battery that is a sign that the battery chemistry is becoming inefficient. Symptoms like battery not being able to hold the charge, sudden voltage drops, voltage sag, and reduced flight time also signify that the chemistry is affected permanently.
The most alarming sign of battery damage you will notice is that the battery will start to heat up. Even when the battery is charging, make sure that it is not getting hot. Without even realizing, the internal resistance causes enough mess already. And what's even worse is that most scientists argue that even with the formulas, it is complicated to measure the exact amount as it might differ according to circumstances. So, take care of your LiPo battery as much as you can.