There is a chance you got a low binned old cell that sat in a warehouse perhaps fully charge for a long time.
While the internal resistance of a cell during discharge does not go up much with age with modern chemistries, acceptability of charge during the CV phase is affected by cycle life/age.
There is a possibility your cell was not 100% fully charge in the CV phase, so, when left to rest, the resting voltage goes down to around 4,10V-4,15V.
However, when tested, almost all the capacity is retained, so it’s only a problem with max SOC.
For now they are included both in the 18650 and 26650 comparator. The 26650 do not have as many cells as the 18650, this makes it easier to find the 21700 cells.
Don’t get me wrong, I’m happy with the wealth of test results in your comparator; but if you decide on a redesign…
It may be nice to have all tests of all sizes in one huge comparator.
Then the user can filter of type, drain and capacity.
For my use that would be great. For example I use the highest capacity 18650 found in your tests. The only 21700’s I’m interested are the ones above that capacity. I don’t need very high drain cells so I would for example filter 21700, 4200 mAh @5A
People that love extreme lights likely will use a far higher drain setting.
Maybe I’m asking/suggesting way too much, but I think it would a very useful upgrade of your site for many.
It may be, but it is not easy for me to do.
One reason for multiple comparators is that they use different scales.
To really make searching flexible I would have to use a data base and do some programming in PHP or JavaScript, this would be a lot of serious work/learning, because I am not very good at these programming languages.
I may add a text based filter function, that could filter on the battery title, i.e. brand, capacity and size. But this is not something I will be doing just now.
Maybe a webdesign ace on this forum is willing to help you.
Another nice thing, without graphs, would be a huge downloadable spreadsheet.
Add a few filters.
The user can then filter, sort, delete, add personal notes, etc
What I might be able to do is a online table (Like my chargers and multimeter tables), but with filters instead of sorting, but what to include in this type of table?
Battery name, battery size, date tested, button top, capacity at 0.2A, capacity at 3A, capacity at 10A, capacity at 20A
Yeah that would be sweet.
I’m sure you can easily embed a google spreadsheet or something like that with little effort, and people could download the whole sheet if they wanted.
So a fully set filter could look like:
Flat top, 21700, >4500mAh @5A
Using filters that way would greatly reduce the list the user has to research by reading the reviews.
Very often you give cells some sort of rating in your reviews. You could add a score field. But perhaps that’s not needed because junk cells won’t pass a filter anyway.
What I am talking about is something like this: Index of reviewed multimeters technical list
That table is not official and will not be update (it will probably be removed soon).
It is easy enough to mark the table and copy it to a local spreadsheet.
I know Dennis.
That’s why I wrote it this way.
It is very good for a company to tell the truth.
It is not a bad idea for the company to say which battery it uses under its cover.
On the contrary.
This makes consumers show confidence in this company.
Bravo Vapcell Dennis and thank you.
Go on like this …
For those who do not know, Panasonic and Sanyo are the same company.
Panasonic bought Sanyo a few years ago.
I wrote this so as not to confuse someone watching me I was going to mention it
Panasonic NCR21700A
and Dennis to write about
Sanyo NCR21700A
And… less sales.
Rewraps are for generating extra cash.
Manual:
“Just buy something that fits.”
versus
“Bad cells may damage your vap, cause injury or even death. See below for a list of approved vapcell dealers”
A company that does not say what battery it uses can cause a serious accident to the user who will rely on what the cover says.
Even more Amperes are listed on the cover that can discharge a battery if I know what the manufacturer says, I will use the battery with the data reported by the manufacturer.
I do not need to mention older bad situations that we all have seen on a video or even a personal level ……
If everyone buys the Sanyo, Vapcell would make no $ on battery sales.
If everyone buys rewraps then capcell does make some extra $ on battery sales.
Really it’s that easy.
I think ZoomieFan means … less revenue for the rewrap company.
If I know which battery is, why should I get the rewrap?
That’s what I think it means.
He’s right … if he means that …
But it’s rare to copy a rewrap company …
I do not see a gain as opposed to the profit it will have if I copied an authentic battery …
…… as a cover I mean of course ……
Sure. My post was just a short statement. No in depth discussion.
I 100% agree there are very bad cells that are not even worth looking at. Everyone reading HKJ’s tests know that.
My point is/was: Sanyo, Samsung, and a few others make very good cells.
The company could have advised those cells.
Rewarpping a Sanyo doesn’t improve its quality somehow.
Exactly. More brands means a bigger chance to find a good deal
He does.
Not copying the rewrap (Vapcell) company.
Just Vapcell rewrapping Sanyo and then sell it as their own. That way they make some cash instead of only Sanyo.
I can imagine there is a profit in it. Numbers as a way of explanation.
Sanyo sells cells for $2/each.
A famous company rewarps them, adds some marketing claims and sells then for $10/each.
Then a copycat rewraps the Sanyo’s with the same wrap and sells them for $5/each.
Or even more illegal, buy junk batteries at $0.50/each and then rewrap and cell as something good and famous.
