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| Rechargable vs. Non-Rechargable Batteries - AA/AAA Size |
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| beanflying:
It was something we figured out back in the early days of NiMh and R/C receiver packs AA's universally SUCK for impedance including Enerloops in higher draw applications. The initial Enerloops were also very temperature sensitive on that front and even near freezing the voltage losses were actually terminal for a few R/C planes as the digital servos loaded up the packs. The higher capacity cells were just a no go for anything needing a bit of performance. The Fix was generally to get out of AA's and go back to bigger framed Sanyo or Panasonic cells to drop the impedance. |
| james_s:
I started buying Eneloops at least 10 years ago and have also bought some of the Japan made Amazon LSD NiMH and some later ones that turned out to be made in China. The eneloops are all still holding up great, and most of the Amazon cells are too. I have had a couple of those get damaged in multi-cell devices where one cell went dead faster and got reverse charged slightly by the other cells. I haven't bought disposable AA/AAA cells in quite a few years now though I've ended up with enough free ones that I still have them in some remote controls. A significant advantage of a good quality NiMH cell is they rarely leak. In fact I don't think I've ever had one leak and I cannot say that about alkaline. |
| magic:
--- Quote from: deadlylover on July 24, 2021, 02:32:12 am --- --- Quote from: cortex_m0 on July 24, 2021, 12:44:28 am ---What is "use and abuse" in your experience? --- End quote --- Deep discharges in flashlight applications. I think camera flashes were another killer. :P --- End quote --- It is said that the biggest killer of NiCd and NiMH cells is polarity reversal, which is what happens when one cell is fully discharged and other cells in series keep forcing current through it, initiating abnormal electrochemical processes which charge the cell in reverse. This trivially happens in "dumb" loads like incandescent flashlights and power tools, but anything with a boost converter in it (LED lights, camera flashes) can do it too. Ideally, such devices should be equipped with undervoltage shutdown. |
| David Hess:
Most NiCd and NiMH failures I have had were due to shorts through the separator. In the past the solution with NiCd cells was to use low leakage/high temperature cells which use a thicker and better separator. After my first batch of normal NiMH cells failed due to shorts after only a couple years, I guessed that low leakage NiMH cells would display the same advantage and as far as I can tell, they do. |
| Miti:
--- Quote from: retiredcaps on July 24, 2021, 02:04:09 am ---Project Farm Which AA Rechargeable Battery is Best after 1 Year? Let's find out! Eneloop, Duracell, Amazon, EBL He measures internal resistance in this video. --- End quote --- I just watched the video. I'm completely sold out to Ikea Ladda... :-+ |
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