Internal resistance of a cell varying with power drawn

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SUMMARY

The internal resistance of rechargeable NiMH batteries varies empirically with the power drawn from them. There is no straightforward mathematical relationship; instead, performance improvements are often achieved through practical experimentation. Warming NiMH cells prior to use can enhance their performance, potentially increasing voltage or reducing internal resistance, which is crucial for applications like electric-powered model aircraft competitions.

PREREQUISITES
  • Understanding of NiMH battery chemistry
  • Familiarity with internal resistance concepts
  • Knowledge of empirical testing methods
  • Experience with electric-powered model aircraft
NEXT STEPS
  • Research the effects of temperature on NiMH battery performance
  • Explore empirical testing methods for battery performance evaluation
  • Learn about voltage drop and its relation to internal resistance
  • Investigate battery management systems for optimizing rechargeable battery use
USEFUL FOR

Electronics enthusiasts, model aircraft pilots, battery engineers, and anyone involved in optimizing the performance of rechargeable NiMH batteries.

CharanV
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If we continue to draw a specific amount of power from a cell (re-chargable), how will the internal resistance of the cell vary? Is there any particular mathematical relation between them? Please help me understand
 
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Here is a sample for NIMH rechargable batteries.
c13_01.gif


It doesn't look like any simple mathematical relationship to me. Strictly empirical.
 
I used to fly electric powered model aircraft in competitions and we would improve performance by warming up the NiMh cells. I'm not sure if increasing the temperature increased the voltage or reduced the internal resistance as the effect is similar.
 

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