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RE: NiMH battery packs on my microRendu streamer - pics

Posted by AbeCollins (A) on October 3, 2016 at 14:46:16

In Reply to: RE: NiMH battery packs on my microRendu streamer - pics posted by theob on October 3, 2016 at 04:27:36:

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.

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