CAUTION !! Misleading budget battery and lumen claims

wus

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I'm looking for a replacement for a 6 cell Sub-C NiMH pack in a handheld vacuum cleaner. The original is stamped with 7.2 Volt 1300mAh (the whole was really cheap). Now I see such packs offered with up to 7 Ah - this seems pretty unbelievable to me.

How much can I currently expect - realistically! - from a good 6 cell Sub-C assembly?
 

uk_caver

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Feb 9, 2007
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Central UK
I'm looking for a replacement for a 6 cell Sub-C NiMH pack in a handheld vacuum cleaner. The original is stamped with 7.2 Volt 1300mAh (the whole was really cheap). Now I see such packs offered with up to 7 Ah - this seems pretty unbelievable to me.

How much can I currently expect - realistically! - from a good 6 cell Sub-C assembly?
Looking at the place I often buy cells from, their Sub-C packs range from a quoted 2200mAh to 5000mAh, and checking out a few other honest-looking vendors, it seems 4500-5000mAh is around the top end of honest capacities, so I'd guess that anything significantly over 5Ah may be being 'optimistically' rated.
 

kreisl

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Jul 5, 2012
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NCR18650B is made in Japan
PVC sleeve made in China
PCB ?? - Made in Germany?
Top button?


All those cells are assembled in China, and nothing wrong with it.
Are we strictly talking lithium-ion cells?

Anyway, the laser pointer of my Bugasalt 2.0 didn't work anymore, so i opened up the battery compartment and was surprised to see some Panasonic AAA inside ;) . The batteries had leaked. I am substituting NiMH AAA, cr*ppy chinese ones, let's see if they still work.

panasonictpk7b.jpg
 
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mr.snakeman

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Stockholm, Sweden
Just read this thread and thought I`d see what EBay has to offer today. Several sellers offering yellow label 9800mAh 18650 Ultrafires and many other "brands" also offering many fantasy mAhs in a variety of battery sizes; for example: 2500mAh in a 16340. The list just goes on! What a mess! Caveat emptor!!!
 
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Sjvalleydave

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Feb 16, 2023
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Caruthers. CA
Just read this thread and thought I`d see what EBay has to offer today. Several sellers offering yellow label 9800mAh 18650 Ultrafires and many other "brands" also offering many fantasy mAhs in a variety of battery sizes; for example: 2500mAh in a 16340. The list just goes on! What a mess! Caveat emptor!!!
It is an absolute cluster out there!. They just make up numbers, it unbelievable. I have a small business doing power tools battery packs. 80% are Li ion, but I still get some NiCD and NiMH. I have a brand, Tenergy, that I use for those type battery. A guy this week dropped off a couple of old Craftsman 19.2v NiCD. Original batteries were 1900mAh. I picked up 15 sub C cells with tabs for approx $27. They are a good cell. A side benefit is that the factory cells were 1900mAh, the new ones are 2200mAh. I only use name brand 18650's from trusted sellers..
 

zerodish

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May 31, 2014
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I think the main problem with lumens is a translation error. The old style 12 volt spotlights on police cars were 100 watts and 300000 candle power. Candlepower is not used much any more. I came across a 26650 Chinese made light that advertized 40000 lumens. 40000 candlepower is quite reasonable in such a light. There are web sites that specialize in making fun of translation errors.
 
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