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Forum Index : Microcontroller and PC projects : 18650 Li-ion Cells Different Length

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Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1106
Posted: 12:17pm 07 Aug 2019
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I picked up (& paid for) a Powertech 18650 Li-ion 2600mAh cell from a Jaycar agent today for a project.

I put it in a holder I had for the other Powertech cell I have & it was a very loose fit. I measured them both & the new one was ~5mm shorter that the older one. The diameters appeared to be the same.

My original holder is a 3D printed one & the battery was a bit of a tight fit it that. I also bought a couple of holders today, one for each of the cells & hoping to replace the 3D one. Of course, the older cell will not fit into the new holder. Bugger.

The code on the original one is SB2403 (which is still OK) & the new one is SB2308 whatever they mean.

Not really a major problem, just a bit of a nuisance.

At least the newer one has a higher rated capacity.

Just saying.....
ChopperP
 
Poppy

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Joined: 25/07/2019
Location: Germany
Posts: 486
Posted: 12:46pm 07 Aug 2019
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Could it be that the longer one has a built-in protection circuit, like this:
http://www.lygte-info.dk/pic/battery/DSC_8575.jpg

and the shorter one does not?
Andre ... such a GURU?
 
Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1106
Posted: 01:20pm 07 Aug 2019
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That's a very good point. Thanks.
No mention of it on the battery though but that doesn't mean much.
Will keep it in mind when I test them out.
ChopperP
 
Poppy

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Joined: 25/07/2019
Location: Germany
Posts: 486
Posted: 02:13pm 07 Aug 2019
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But generally Beware, a protection circuit could be incompatible with a charging circuit or when there is no protection at all ... Li-Batteries are great firecrackers!


I still stick to 3 X 1.2V NiMh instead.
Andre ... such a GURU?
 
Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1106
Posted: 09:20pm 07 Aug 2019
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Thanks for the warning.
ChopperP
 
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