Test/Review of Samsung INR18650-25R 2500mAh (Cyan)

Samsung INR18650-25R 2500mAh (Cyan)

Official specifications:

  • Nominal discharge capacity: 2,500mAh
  • Nominal voltage: 3.6V
  • Standard charge: CCCV, 1.25A, 4.20 ± 0.05 V, 100mA cut-off
  • Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off
  • Charging time: Standard charge : 180min / 100mA cut-off
  • Rapid charge: 60min (at 25°C) / 100mA cut-off
  • Max. continuous discharge: 20A(at 25°C), 60% at 250 cycle
  • Discharge cut-off voltage: 2.5V
  • Cell weight: 45.0g max
  • Cell dimension: Height : 64.85 ± 0.15mm, Diameter : 18.33 ± 0.07mm
  • Operating temperature (surface temperature): Charge : 0 to 50°C (recommended recharge release < 45°C), Discharge: -20 to 75°C (recommended re-discharge release < 60°C)
  • Storage temperature (Recovery 90% after storage): 1.5 year -30~25°C, 3 months -30~45°C, 1 month -30~60°C

A high current 2500mAh cell.

This is very good discharge curves, the cells tracks fine and capacity do only drop slight at high load (30A is overload and do not count).


This is a very good high current cell.
Comparing it to the green version of the same cell it has better performance, this may be due to a improved cell, but it can also be due to age and/or storage conditions.

Notes and links

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries

HKJ we are all more grateful then a short post can say.

I am still trying to figure out how you pay your mortgage doing free battery reviews :wink:

It seems that this is your full time job right?

Oh and an aditional explanation is, that Blue is a stronger color (everyone knows that) :slight_smile:

I predict we will soon see Chinese fire cells in blue (sorry cyan), any takers?

Its name is derived from the Ancient Greek κυανός, transliterated kýanos, meaning “dark blue”.[8][9] It was formerly known as “cyan blue”[10] or cyan-blue[11] and its first recorded use of as a color name in English was in 1879.[12] Further origins of the color name can be traced back to a dye produced from the cornflower (Centaurea cyanus).[13][14]

The web color cyan is synonymous with aqua. In most languages, ‘cyan’ is not a basic color term and it phenomenologically appears as a greenish vibrant hue of blue to most English speakers. Reasons for why cyan is not linguistically acknowledged as a basic color term can be found in the frequent lack of distinction between blue and green in many languages. Some varieties in the cyan color range are teal, turquoise, electric blue, aquamarine, and other colors described as blue-green.

I do also have a regular job.

My test stations works full time, for batteries I only need to do photos and writing. I have publish an article about my lab setup: https://budgetlightforum.com/t/-/28172

Are those newly purchased cells? All retailers that I know of sell green ones. Personal testing (though with a lot simpler equipment, a UNI-T DMM and a resistive load) shows that the green 25Rs are inferior compared to price-equivalent HE2/HE4 cells by LG. It’d be interesting to know what truly happens.

I thought the green ones were the new ones? If so, then the newer cells are worse than the older cells.

The ones I buy from Richard at mountain are exactly like these, so I do not think these are the old version.

10x for the review m8

And they are all saying cyan and green should be equal….claim that green ones are the newer…. :~

Anyway, from my personal experience ( from green ones) their drain capability varies alot( 10% at least)

It is the old ones . The second batch.

Great battery .

Fasttech sells the cyan (BLUE) one… I’ve received them like 1 year ago.
I doubt the green ones are the newer version…I think it’s the opposite… i find difficult to find the green ones online…and i think a web shop usually has a faster cycle time of restocking items than a physical retailer

and the HE2 are better for the initial less sag, later 25R are better and compensate so… overall differences are negligible, they are the best 18650 IMR cells you’ll find

1 year ago is too long ago. Ever since the start of 2015 all blue ones disappeared from the market. I have purchased 12 pieces of 25Rs at different points in time from January to late April, from either nkon.nl (that I assume has fresh stock due to workload) and a local vaping shop and they were all green.

My bad…. I bought my 25R on 16/12/2014 5.5 months ago.

Well, that explains everything

And it seems that at the end the green ones are the latest revision…should be better…who knows, maybe HKJ just tested a bad batch