Understanding Battery Memory: What Causes It and How Does it Work?

In summary, in a physics class, the topic of how batteries work was discussed. One aspect mentioned was battery memory, where repeatedly discharging and recharging the battery at only half capacity can cause it to think that half capacity is empty. However, it is believed to be a myth for nickel cadmium batteries. Further information can be found in the links provided.
  • #1
dusty8683
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in my physics class we learned about how batteries work. my teacher briefly talked about battery memory (how if you only let it discharge half way and recharge it and keep doing that cycle... the battery will think half way is empty) but he didn't give an explanation why. I'm somewhat familiar with batteries now and how they work so if someone can tell me exactly what happens inside the battery during this process that would be great. thanks.
 
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  • #2
I've often heard that nickel cadmium batteries may develop a "memory" if not discharged completely but from what I've found, this seems to be largely a myth. I'm not sure of the details behind this process but here are some links that may help you.

http://www.repairfaq.org/ELE/F_NiCd_Memory.html

http://bex.nsstc.uah.edu/PH337/lab1/b01.html

http://www.fyre-fraust.ca/digitalfusion/sbr/charger.htm
 
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FAQ: Understanding Battery Memory: What Causes It and How Does it Work?

1. What is battery memory?

Battery memory is a phenomenon that occurs in some rechargeable batteries, where they seem to remember the amount of charge that was previously used and have a reduced capacity to hold a charge over time.

2. What causes battery memory?

Battery memory is caused by repeated partial discharges and recharges of a battery. This can happen when a battery is not fully discharged before recharging, causing the battery to "remember" the shorter discharge cycle and have a reduced capacity in the future.

3. How does battery memory affect battery life?

Battery memory can significantly reduce the overall lifespan of a battery. As the battery "remembers" shorter discharge cycles, it will have a reduced capacity over time, leading to more frequent charging and ultimately a shorter lifespan.

4. Can battery memory be prevented?

Battery memory can be prevented by fully discharging and recharging a battery periodically. This will help to reset the battery's memory and maintain its full capacity.

5. Which types of batteries are most susceptible to battery memory?

Nickel-based rechargeable batteries, such as NiMH and NiCd batteries, are the most susceptible to battery memory. This is because these batteries have a higher memory effect compared to other types of rechargeable batteries, such as lithium-ion batteries.

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