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In Reply to: RE: NiMH battery packs on my microRendu streamer - pics posted by AbeCollins on October 04, 2016 at 06:03:55
"...I used what I had on hand..."
Ok. I buy that. I just wanted to mention LiFePOs, so that people don't think NiMH is the best of all choices.
All these battery packages also need cell-balancing while charging etc.
All that is not as easy as it might looks on the first glance.
I still think SuperCaps can do better.
Just saw that UPtoneAudio offers the LPS-1 400$ Ultracap device (1.1A limit). Obviously 1.1A is quite low.
Perhaps something you should have a look at!??!
Follow Ups:
"I just wanted to mention LiFePOs, so that people don't think NiMH is the best of all choices."
Sure, but IMHO "the best of all choices" is very application dependent. NiMH is in fact the best of all choices for -MY- application and not only because I already had one on hand.
The ideal voltage for the microRendu is 7v and with NiMH I can get a nominal 7.2v because each cell is 1.2v (6 cells x 1.2v). Had I gone with LiFePO4 (at 3.2v per cell) I would have been around 6.4v with two cells (kind of low) or 9.6v with 3 three cells (too high). From experience, I know that the microRendu runs quite warm at 9v so I didn't want to go there.... AND I didn't want to use a voltage regulator on the battery output to lower it. A two cell LiFePO4 6.4v battery pack is too low and approaching the drop-out limit for the microRendu's internal regulator.
Of the "Lithium family" I agree that LiFePO4 is the way to go. They don't have quite the energy density of other Lithium types but they're so much safer. They also have a nice flat discharge curve whereas other Lithiums taper off linearly as they deplete. But NiMH was my choice given the details provided in the prior paragraphs.
Yes, SuperCaps are awesome but the complexity surrounding their use is not something I wanted to deal with, and I didn't want to pay $400 for the UpTone LPS-1. Ouch! It's expensive BECAUSE OF the complexity in properly dealing with UltraCaps. A 7.2v NiMH pack was the obvious choice given the parameters I wanted to meet for MY application.
NiMH D batteries have a very flat discharge curve, so you won't get any peakiness until they're pretty much flat. Also, 1.20v is their nominal voltage, just before the elbow/drop. With 6 in series, you're probably closer to 8.4v after they've been freshly charged.
That Tensai brand is fairly adept and at 8000mAh and with only a 250mA draw, you get a lot of music before you need to recharge.
Chris
...sometimes simple is better and the NiMH solution is simple, inexpensive, and suits my application requirements more closely than other battery types.
Edits: 10/04/16
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