Vapcell 16340 Cell Review

Vapcell 16340 Cell Review

This Vapcell 16340 is an unusual cell because it’s a high-discharge 16340! That makes it quite interesting. Read on for lots of data!

Official Specs

Here’s a link to the Vapcell 16340 Cell product page.


My test cells came straight from the manufacturer, but my usual cell store has these in stock for $3.99 each.  Here’s a link to, where you can purchase these cells. 

Short Review

The capacity plus the current rating put these in their own category.  They seem to test near enough to the claim that they’re easy to recommend.

Long Review


I got two, so I got a plastic container suited for these 16340 cells.  They were each in a cellophane baggie, too. 

Build Quality

Good build quality, as expected.  The wrapper is white, the lettering is gold, and there’s a scratch-off proof-of-authenticity check, too.  

These are button-top cells.  I do not believe they’re available in the flat top format, but that’d be a nice addition to the lineup.


I measure these at 34.26mm long, and 16.62mm in diameter.  A true 16340 cell, despite being button top.


I’ve tried to keep the scales similar to other cells of the same size, so over time the charts will be generally comparable.

Discharge tests


The capacity doesn’t quite test up to 800mAh.  I’d call 97% good enough though, and it could even be down to warmer room temp causing the disparity.  So not a massive problem.  



“Bounce back” is what the cell voltage does when the cell rests after a discharge. After heavy discharge rates, the cell voltage bounces back higher when discharge is stopped.  This corresponds to a discharge amount of less energy and does mean that there’s energy left in the cell.  So if I selected the cell with the highest bounce back voltage (ie the cell that was discharged at the highest current), then discharged it to 2.8V at 0.2A, I’d still find that there was a lot of energy still in the cell. 

Here is why I think it is so interesting about “Bounce.”  A poorly performing cell will bounce back higher after high discharges.  That’s because the IR is higher, and because the cell performs much worse under high loads.  So a good-performing cell will bounce back much less because it’s much more capable of high discharge.  At high discharge on a capable cell, more of the energy makes its way out of the cell!  Hence less bounce. 

I more or less figured this out on my own, so I welcome discourse about this topic.  Until I hear it’s wrong, I propose this as a new metric for cell quality!

Charge Test


The cell doesn’t heat all that badly even at the rated 7A discharge.  Could it handle more?  Well based on temperature, probably, but it’s rated to 7A, so let’s stick to 7A.

Power, Constant

Internal Resistance

Most often (read: always), internal resistance is mentioned as a spot value.  In truth, the IR changes over time.  Due to cell age and cell heat among other things.  A graph of IR is interesting because it can show, for example, when a cell begins to “die” – at which point the remaining energy will be “harder” to extract.  This is when the IR spikes.  In the graph below, that’s around 750-800mAh.  These graphs are also useful for determining if a cell would be good for a hot-rod flashlight, for example.  


This is a great cell.  Buy it for capacity.  Buy it for good discharge currents.  Buy it because it has a pretty wrapper.  Either way you’re going to end up with a nice 16340!


  • These cells were provided by Vapcell for review. I was not paid to write this review.
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2 thoughts on “Vapcell 16340 Cell Review”

  1. Carel van Heugten

    Thanks for your thorough review! Informative and readable as always.

    Only.. the subject itself raises questions. Not about the quality of the cell but about the number of different cells that come to market. 16340 is completely new to me. But there are more new formats. The 14500 in for instance the Lumintop tool AA. Oh, thats the first that has the same size as the classic AA Alkaline battery..

    We all flashaholics were used to 18650 cells. In most flashlights they work very fine. All variants included. I have many 18650 cells.
    Then the 26650 came. And later the 21700.. both excellent powerhouses.

    I understand that these new variants offer new possibilities in design and there is less need for unique nonstandard powercells (thats a good thing, nonstandard is bs, replacing almost impossible)

    So standardization is on the run. And in most cases thats not a very good sign


  2. Nice review, very thorough! I don’t know now many battery reviews you’ve done in the past, but I’d love to see comparative test data with other competitive 16340 cells, like the EFEST V2 or the IMREN 700 mAh. I’ve got a lot of 16340 size lights – they make a great EDC in general and am always in the hunt for the next best cell for my hot rod modded up 16340 lights. Right now the IMREN is about the top of my list but the Vapcell is worth checking out, but unfortunately, Jon’s shipping costs at Liionwholsale is ridiculously high right now – for a pair of these cells almost doubles the price w/shipping ($7.50), so he’s no longer an option for me. IMRBatteries is cheaper shipping ($6.00), but also a bit high. MtnElectronics ships a pair of 16340’s for $3.60, which is about the best deal around but doesn’t have decent 16340 cells in stock.
    From HKJ’s review of this Vapcell, it looks like it’s the lowest resistance 16340 around, just need to find a cheaper source.

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