How to change the charging time (battery)

AI Thread Summary
To improve charging time for a battery with a 10V emf and 1kOhm internal resistance, increasing the voltage is typically the most effective method, as seen in smart chargers. However, adding components to the circuit can lead to longer charging times due to increased resistance. A key factor in battery efficiency is the full cycle efficiency, which can be negatively impacted by high charging voltages relative to output voltage. Different types of rechargeable batteries have specific charging requirements, making it essential to tailor the charging circuit accordingly. Overall, careful consideration of voltage and battery type is crucial for optimizing charging efficiency.
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the source is 120V DC with an internal resistance of 40 Ohms. the battery's emf is 10V with an internal resistance of 1kOhms. what can i add to the circuit to improve the charging time (faster charge)?
 
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Nothing, the more you put in the circuit, the longer the charging time.
 
One of the requirements of a "good" rechargeable battery is the full cycle efficiency. If you had a battery that could recycle 100% of the Coulomb charge, but took 14 volts to charge, with only 12 volts out (like a car battery), that is only 86% efficiency. If you charge with 120 volts, and get 10 volts out, that is a very poor efficiency.
 
Most batteries have a limit on how fast they can be charged, so you need to be careful. The normal way the charge rate is sped up is to increase the voltage. This is how the "smart" chargers for radio control model batteries work, they ramp up to a set amperage by increasing voltage, then periodically shut off the charge current and sample battery voltage.
 
A lot depends on what type of rechargeable battery it is. Different types require different charging circuits.
 

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