Battery life cycle also depends on other factors — like if it’s often left (for a somewhat long period of time, like several months) in a fully-charged state (staying at or near the full 4.20v without getting used at all), or in a very discharged state (like below maybe 2.5v or around that) — that appears to degrade the cells faster too.
Samsung 30Q has a big problem - high selfdischarge. Probability is increasing with utilization. Compare Samsung 30Q versus SONY VTC6 selfdischarge. Both cells are after the same cycle aging test.
New 30Q cell at 100 % SOC shows little bit worse selfdischarge than other cells from the very beginning.
Probably is worsening gradually during using. The cells (30Q and VTC6) from comparative 72 hours test are after 700 cycles : charge 1A to 4,1 V, 0,1 A cut-off, discharge 2,5 A to 3,3 V.
Mooch´s accelerated life cycle test from gotlib´s link can be relevant for vaping maybe, but definitely not for flashlight. 4A charge and 15 A discharge are parameters to kill the cell early.
Have no data on the new 30Q6-T you mentioned.
Hello
thank you very much for your very precious information! @docware thank you for your screenshot and graphic very interesting! so for my sofirn q8 you recommend me rather the sony vtc6 than the samsung 30q?
if so, would you know by chance where i can buy the cheap vtc6 shipped to France?
I definitely cannot recommend Samsung 30Q. There is too much info about 30Q high selfdischarge from various ebike forums.
In Europe is nkon https://eu.nkon.nl/ considered to be trustworthy supplier :
You just must accept that Sony products doesn´t belong to „cheap“ category.
no that’s not it :
if you live in USA maybe you see them : available on their site
but me from France, they wrote well :
US18650VTC6 3000mAh - 30A button top” is not available.
= out of stock
and i made a mistake :
i thought i read yesterday on their site that they would be available again on February 9 .Mut i was wrong :
it only concerns the ” flat top ” version
-For the button top they do not announce any availability date it’s worse than i thought! :weary:
Hmm, that´s bad.
I live in Europe, Czech republic.
You have an alternative option, LG HG2 button top. I checked that they are really in stock.
I recommend to use DPD for shipping, have wrong experiences with other options.
thank you for this information
yes i have a soldering iron
but li-ion batteries scare me a little….because i know they can be explosive with metallic objects in contact…finally that if they touch pole + and pole - at the same time…but hey it scares me anyway
if there is a youtube video, that will reassure me immediately…
but also, where to find the button top for purchase?
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
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
-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 :
and mine is a real one but i knew it because i was told that nkon are serious
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