Timeline for Voltage input for charging NiMH Batteries
Current License: CC BY-SA 2.5
14 events
| when toggle format | what | by | license | comment | |
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| Jan 11, 2011 at 22:52 | vote | accept | Dean | ||
| Jan 9, 2011 at 15:50 | history | edited | tyblu | CC BY-SA 2.5 |
Fixed up to relate charge times explicitly to rates of charge (w.r.t. capacity), not actual charging time.
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| Jan 9, 2011 at 13:41 | comment | added | tyblu | @stevenh, yes, thank you. I believe Energizer's recommendation was in relation to charge rates, and charge termination logic is handled seperately. I'll fix it up for clarity. | |
| Jan 9, 2011 at 13:38 | comment | added | stevenvh | @tyblu: well, my point was that you can't just divide the capacity by current to find time. | |
| Jan 9, 2011 at 12:34 | comment | added | tyblu | @stevenh, One of the listed sources claims 60%-70% efficiency. | |
| Jan 9, 2011 at 12:18 | comment | added | stevenvh | Charging an 850mAh battery for 2 hours at 425mA may be arithmetically sound, but starts from the idea that charging is 100% efficient. It's not. I guess depending on your charging method efficiency is limited to about 80%. So if you charge at 425mA, you'll have to charge for 2.5 hours. | |
| Jan 9, 2011 at 12:00 | history | edited | tyblu | CC BY-SA 2.5 |
Added calculation for 12 series-connected cells; small correction to 4 series cells calculation.
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| Jan 8, 2011 at 23:34 | comment | added | tyblu |
@NickT, Aye! [#cells]xI_chargex(120mΩ)+1.2V+1.25V+[#cells]x1.78V. Complication is good for the soul, though (and the snowed-in weekend).
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| Jan 8, 2011 at 23:22 | vote | accept | Dean | ||
| Jan 8, 2011 at 23:29 | |||||
| Jan 8, 2011 at 22:17 | history | edited | tyblu | CC BY-SA 2.5 |
Fixed link.
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| Jan 8, 2011 at 21:52 | comment | added | Nick T | So...short answer = max cell voltage (1.78 V) × number of cells + LM317 dropout at your charging voltage (~2 V) + voltage across resistor (1.25 V, always). | |
| Jan 8, 2011 at 21:47 | history | edited | tyblu | CC BY-SA 2.5 |
Fixed!
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| Jan 8, 2011 at 21:32 | history | edited | tyblu | CC BY-SA 2.5 |
Diagram may indicate 4 series-connected AAA batteries; smart charging solutions will be considerably more complicated.
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| Jan 8, 2011 at 18:01 | history | answered | tyblu | CC BY-SA 2.5 |