Best deal for 3500mAh unprotected 18650 cells

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MascaratumB
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You don’t need to solder a “top”, you need to “melt the solder” on the top !
Check this thread.

https://budgetlightforum.com/node/55871

gotlib
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MascaratumB wrote:
You don’t need to solder a “top”, you need to “melt the solder” on the top !
Check this thread.

https://budgetlightforum.com/node/55871

thank you for your link
i saw the video and read the posts, and it’s very technical to do…temperature adjustment and welding time …if i badly solder the battery and then it charges badly …

apart from that i removed the plastic wrapper from 1 of my batteries Samsung 30Q who died.
Just to see how the “ button top “ is welded on it .
I bought them from Nkon.nl 2 years ago

here are the pictures of my battery Smile

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their welding methods are completely different….

the writings on it, i don’t know what that means, i would have liked to know the date of their manufacture
Image

Image

-I had read this post where the person said that you have to scratch the edge of the battery and if an inscription appears, it is that they are real batteries, no counterfeit :
https://budgetlightforum.com/node/73361?page=1
and mine is a real one but i knew it because i was told that nkon are serious Smile

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gotlib
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I just found this very simple solution: a magnetic button top that would simply land on it ? :

Image

https://fr.aliexpress.com/item/32861789841.html?spm=a2g0o.detail.1000014...

but with this solution, will the battery charge well as original ? and also this magnetic button not being welded, it may move and that scares me a little….

I also found this other solution, but it is more complicated, to do spot welding ,change plastic wrapping of the battery and replace the ring….. you have to have the material and above all know-how Sad

https://fr.aliexpress.com/item/32857052131.html?spm=a2g0o.detail.1000014...

d_t_a
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Location: Manila, Philippines

Regarding Sofirn/BLF Q8, Sofirn SP36/Anduril, Haikelite HK04 soda-can style lights that require multiple 18650 batteries — so far I’ve been using flat-top 18650s for them (unprotected button-tops are harder to find from my place, or they are lower-drain types like NCR18650B), but based on my experience with these lights:

- genuine Sanyo NCR18650GA (raised flat-top) work properly (make contact)
- genuine flat-top Sony VTC (VTC6/VTC5) work properly (make contact)
- genuine flat-top LG HG2/MJ1 work properly (make contact)

- however, genuine Samsung 30Q / 35E, which have a bit recessed flat-top, may not always maintain proper contact on the above-mentioned lights, so I would not suggest to use them for these lights.

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There’s mention about using magnets on flat-tops — I’ve been using such magnets for single-battery lights (or when 2 batteries in series) that require button-top to make contact with the positive side. But would not suggest using them for the soda-can lights, since these magnets can go out of position and possibly cause a short, which can mean batteries and/or flashlight get a short-circuit – in a not-so-worse case scenario, the spring inside the soda-can light may soften or melt (then disconnects the contact?)… In worse-case scenario, I’m not sure what might happen…

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