Just Received Amazon NiMh D cells that were marked as Warehouse Deals inspected Repacked

OttaMattaPia

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Dec 3, 2016
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135
Never had this happen before. They always came sealed in a fresh package. These appear to be "Previously used" batteries but sold at the normal "New" price.
The package was a bit rough and obviously re-taped.

I know, I can check the capacity. But since NiMh batteries will maintain nearly their full capacity until several hundred cycles, they theoretically "could" have been through 2 or 3 hundred cycles (or more) already.

Another thing that concerns me a bit is that the boxes these come in seem to have a date stamp sticker on the outside.
This particular box was dated 2020 whereas all the sealed and unbroken packages have a 2021 on them.
Like they're exhausting old stock or a returns pile somewhere.

I probably shouldn't complain since these are very hard to come by now and these batteries usually meet or exceed their 10000mAh rating.
And because NiMh D cells of this capacity are usually more than twice as much (if you can even find them)

They are being capacity tested now. Their internal resistances seem ok at about 15millohms each (one at 20)
They may be perfectly fine. I'll know their capacities tomorrow. I certainly wouldn't want used rechargeable batteries purchased at new battery prices in any event.

Wondering if anyone else has had this happen with batteries

AmazonInspectedAndRepacked.jpg
 

OttaMattaPia

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Dec 3, 2016
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First results are in.
First battery to complete the test came in below advertised capacity (first time I ever had that happen with these Amazon Basics)

AmazonBatteryFailure.jpg
 

OttaMattaPia

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Joined
Dec 3, 2016
Messages
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Two of the batteries tested ok.
Two tested 15% below advertised capacity.

One oddity is that the two that measured low eventually came up but their DISCHARGE capacity is consistently higher than their CHARGE Capacity. Repeated cycling does not seem to improve this. According to Battery University, that is an indication that internal damage is causing those cells to spike in their voltage thus ending the charge cycle. It takes a 2nd charge to bring them up to their full capacity.

Definitely not the sign of a healthy battery.
 
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