- #1
Calculating Resistor Size for 3V Battery
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Discussion Overview
The discussion revolves around determining the appropriate resistor size for charging a 3V battery, with considerations of safety and battery chemistry. Participants explore various methods and implications of using different components in the charging circuit.
Discussion Character
- Technical explanation
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant inquires about how to calculate the resistor size for a 3V battery.
- Another participant asserts that using a 5.1V Zener diode for charging a 3V battery is not safe and suggests a 3-terminal linear regulator as a better option.
- A different participant emphasizes the complexity of battery charging, which varies by battery chemistry.
- One participant humorously warns about the dangers of using a Zener diode in this context, suggesting a 35Ω, 50Watt resistor if the approach is insisted upon, while advising to take safety precautions.
- Another participant agrees with the complexity of battery charging and encourages checking additional resources for more information.
Areas of Agreement / Disagreement
Participants express differing views on the safety and appropriateness of using a Zener diode versus a linear regulator for charging a 3V battery. There is no consensus on the best approach, and the discussion remains unresolved regarding the optimal method for charging.
Contextual Notes
The discussion highlights the importance of battery chemistry in determining charging methods, but lacks specific details on the types of batteries being referenced. There are also unresolved safety concerns related to the proposed methods.
- #2
berkeman
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You cannot use a 5.1V Zener diode in a regulator for charging a 3V battery...
And Zener regulators are pretty sloppy anyway -- in general it's a lot better to just use a 3-terminal linear regulator. And battery charging can be a fairly complicated matter, depending on which battery chemistry you are working with...
And Zener regulators are pretty sloppy anyway -- in general it's a lot better to just use a 3-terminal linear regulator. And battery charging can be a fairly complicated matter, depending on which battery chemistry you are working with...
- #3
Tom.G
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@John1397, As berkeman stated...
If you really insist on this approach, do it out doors, nothing around that you want to keep (like people, animals, or houses), and don't mind destroying a battery, then a 35Ω, 50Watt resistor would be about right.
Oh, and stay up-wind of it.
I really recommend that you take heed of the approach by @berkeman though.
That said, here is a sight with a great amount of information about batteries and how to charge and use them: https://batteryuniversity.com
Cheers,
Tom
Since you didn't give many details, here is the scenario:berkeman said:
If you really insist on this approach, do it out doors, nothing around that you want to keep (like people, animals, or houses), and don't mind destroying a battery, then a 35Ω, 50Watt resistor would be about right.
Oh, and stay up-wind of it.
I really recommend that you take heed of the approach by @berkeman though.
That said, here is a sight with a great amount of information about batteries and how to charge and use them: https://batteryuniversity.com
Cheers,
Tom
- #4
berkeman
Admin
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LOLTom.G said:
- #5
dlgoff
Science Advisor
Gold Member
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Indeed.berkeman said:
For the OP, check out https://batteryuniversity.com/index.php/learn/.
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