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In Reply to: RE: NiMH battery packs on my microRendu streamer - pics posted by AbeCollins on September 30, 2016 at 10:19:23
I'll have to try this Abe. Thanks for sharing.
Follow Ups:
Aren't you guys worried about fire risk? My understanding is that LiFepo4 has little or no such risk. I used LiFeSo4 batteries for 3 years or so with no problem. I am now using a Vinnie Rossi DHT with microRendu output voltage port so I am officially out of battery usage now.
Edits: 10/09/16
LiFePo4 is generally considered the safest of the three common li-ion chemistries, but if you use a quality CC/CV charging algorithm and don't run them dry, you're fine there.
Chris
Fire? You're probably thinking of Lithium-Ion (Li) or Lithium-Ion Polymer (LiPo or Li-Poly) batteries. I'm using NiMH batteries.
The material within NiMH batteries is inherently non-flammable which is not the case for any Lithium types including the Lithium Iron Phosphate family (LiFePO4, LiFeSO4). Lithium Iron Phosphate (LiFe) types are considered to be much safer than Li-ion and Li-Poly but they still have shipping restrictions for good reason.
However, "NiMH batteries are considered to be "Dry cell" batteries and are unregulated for purposes of transportation by the U.S. Department of Transportation (DOT), International Civil Aviation Administration (ICAO), International Air Transport Association (IATA) and International Maritime Dangerous Goods Regulations (IMDG)." Not so for batteries in the Lithium family.
ANY battery can be a fire hazard if improperly handled, charged or discharged.
Any fully charged battery can only dissipate overcharge energy as heat. My 10Ah NiMH battery has a thermal cutoff circuit but at the 1-Amp charge current that I use on it, the battery barely gets warm during charge. It's spec'd for up to a 3-Amp charge current. I charge at 1/3 of that rating. Additionally, the smart charger shuts off once the battery is fully charged.
At a discharge current of only 0.25-Amps for my microRendu & DAC, the 10Ah NiMH battery doesn't get warm at all. The battery is rated for up to 30-Amps of discharge current. I am 120x below the maximum current spec.
I am not worried at all.
I use the Sonore Signature Power Supply for my microRendu. But, I will probably check out Abe's solution since it doesn't cost very much.
If we stop hearing from Abe, I guess you'll have your answer :-)
Not that you need the exact same setup but here is what I have:
7.2v 10Ah battery with standard male Tayama terminal at end of cord:
http://www.batteryspace.com/customized72v10ahnimhbatterypack3x2rconfigurationtrail-techfemaleplug.aspx
Charger with female 5.5mm x 2.1mm barrel connector at end of cord:
http://www.batteryspace.com/multi-currentsmartcharger1-2aforany48v-108vnimhnicdbatterypacks-ullisted.aspx
A a couple standard Tayama female to 5.5mm x 2.1mm barrel adapter cables:
http://www.batteryspace.com/Connector/Adaptor-From-5.5mm-x-2.1mm-Barrel-Male-to-Standard-Tamiya-Female.aspx
And here's the other battery that I have. It's a smaller 5Ah model:
http://www.batteryspace.com/nimhbatterypack72v5000mah6xc36whfor6vportabledevices.aspx
I paid online via their website and PayPal.
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