Skip to main content

Samsung 21700 battery battle: 50G vs 48G vs 50E

Samsung has a good lineup of 21700 Li-ion batteries and when i tested INR21700-50G i thought it would be interesting to test INR21700-48G cell too because the new batch of 48Gs came in green heat shrink tube (the version i tested before was gray). Then i added 50E results to comparison as they are very close in capacity and max discharge rate.
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
The batteries were bought from Queen Battery which is my reliable supplier of genuine cells and tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.
ZKETECH EBC-A20 4-wire battery tester (Li-ion, LiFePO4, Lithium Titanate, 18650, 21700)

50G and 48G cells were tested using my battery holder v.4.0. A detailed video about it is available on my channel.

Thunderheart Reviews Battery holder v.4.0 | 18650 21700 26650 26800 32700 battery holder cell holder adapter

I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hr pause. The environment temperature was 25±2°C. To be sure in results i've done each test minimum twice (usually 3-7 times).


Samsung INR21700-50G

Samsung 50G comes without any heat shrink tube on it and all the markings are printed on the cell barrel. The printing is not resistant to ethanol-based degreasers and is washed away easily, so if you're going to put a tube on 50G be careful while degreasing the cell surface. The cell is marked as:
INR21700-50G
SAMSUNG  SDI
        2J23

There is also a 2D matrix code and 2 other markings:
N50G+
J2KA1

and
F285
B8

SAMSUNG 50G Li-ion battery

Samsung 50G has the following specs according to its official datasheet (pdf):
Minimum capacity: 4850mAh
Nominal voltage: 3.63V
Standard charge current: 1.6A (0.33C)
Charge cut-off current: 121mA (0.025C)
Max. charge current: 4.85A (1C)
Charge end voltage: 4.2V
Max. discharge current: 9.7A (2C)
Discharge cut-off voltage: 2.5V
Max pulse discharge: 14.55A (3C)
AC impedance at 1kHz: 14±5mΩ
Max weight: 69.5g

Cycle life:
Using 1.6A/0.33C charge current with 242.5mA/0.05C cut-off and 4.85A/1C discharge with 2.5V cut-off after 1000 cycles the capacity should be ≥3880mAh (80% of std capacity).

DC IR at 4.85A in fully charged condition was 20±1mΩ (measured using EB Tester Software's Resistance test feature).

Measured weight (without heat shrink tube): 68.02g

Samsung 21700 battery 50G | Thunderheart Reviews

 Samsung INR21700-50G battery's discharge capacity test results:

SAMSUNG 50G Li-ion battery capacity test

The real capacity doesn't reach 5000mAh but it's above 4750mAh even under 10A load. Curves look good.

Samsung INR21700-48G (green)

This time 48G cells came in green heat shrink tube. The previous version was gray. I don't have any information if there are any changes in chemistry but if you know something please share in comments.
The cell is marked as:
INR21700-50G
SAMSUNG  SDI
2       2IB1

There are also two 2D matrix codes and a marking on the barrel, under the tube:
M8IB
7A321

SAMSUNG 48G Li-ion cell capacity test

Samsung 48G has the following specs according to its official datasheet (pdf):
Typical energy: 17.4Wh
Minimum energy: 17.04Wh
Typical capacity: 4800mAh
Minimum capacity: 4700mAh
Nominal voltage: 3.6V
Standard charge current: 1.44A (0.3C)
Charge cut-off current: 96mA (0.02C)
Max. charge current: 4.8A (1C)
Charge end voltage: 4.2V
Max. discharge current: 9.6A (2C)
Discharge cut-off voltage: 2.5V
Pulse discharge (at 23°C ambient temp)
35A for 10 seconds
25A for 30 seconds
18A for 60 seconds
AC impedance at 1kHz: ≤35mΩ
Max weight: 69g

Cycle life:
At 23°C using 1.44A/0.3C charge current with 240mA/0.05C cut-off and 4.8A/1C discharge with 2.5V cut-off after 500 cycles the capacity should be ≥3525mAh (75% of minimum std capacity).

DC IR at 4.8A in fully charged condition was 17±0.7mΩ (measured using EB Tester Software's Resistance test feature).

Measured weight (without heat shrink tube): 67.4g

SAMSUNG 48G Li-ion cell capacity test

 Samsung INR21700-48G battery's discharge capacity test results:

SAMSUNG 48G Li-ion cell capacity test
At 0.2C discharge the capacity is in the middle from minimum to typical specified by Samsung. The capacity remains >4600mAh all the way up to 10A. Curves don't have any sudden drops.

Samsung 50G vs 48G (green) vs 50E

The results of 50E i took from my tests published before. Keep in mind that it was tested using previous version of my battery holder and its standard charging current is noticeably higher than 50G's and 48G's - 2.45A.

SAMSUNG 50E Li-ion cell capacity test

Comparison at 2A discharge current:
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
50E's capacity is a bit higher than 50G's but the energy is almost the same. 48G takes 3rd place.

Comparison at 5A discharge current:
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
The capacity of 50E is still a bit higher than 50G's but the curves show that its voltage is always lower all the way from start to the end and the energy is where the truth is hidden - 50G has more energy. 48G is again the 3rd.

Comparison at 8A discharge current:
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
Here is where the 50G takes the leadership. 50E is closer to 48G - the difference in energy is only 0.15Wh.

Comparison at 10A discharge current:
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
50G keeps the 1st place while 50E becomes even closer to 48G in capacity. The difference in energy is still the same - 0.15Wh.

Cycle life comparison:
Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium
48G is the clear outsider while two other cells can both take th first place. On one hand 50G should have 3880mAh after 1000 cycles (!!!) which sounds very impressive, but on the other hand 50E should have 3802mAh after 500 cycles each time being charged at 1.5 times higher current than 50G. I can't name the winner so i leave this up to you.

Here is the video version of this review:

Samsung 21700 battery battle: 50G vs 48G vs 50E comparison | Thunderheart Reviews | 18650 battery test capacity test Li-ion Lithium

Check out my YouTube channel for batteries, chargers and other stuff reviews.

Popular posts

Sony VTC6 - a 3000mAh/30A monster in 18650 size

Sony US18650VTC6 (or just VTC6) is a high drain 18650 size Li-ion cell which supports discharge rate up to 15A if no temperature control is used and up to 30A with 80°C temperature cut. The battery was bought from my reliable supplier ( Queen Battery ) and tested  with  ZKETECH EBC-A20  and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals I've  all the prescriptions of the  IEC61960-2003  standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 23.0-24.5°C. To be sure in results i've done each test  minimum twice  (usually 3-4 times). Sony US18650VTC6 The  c ell is  marked a

Samsung 50E capacity test - 5000mAh or not?

Samsung INR21700-50E is a 21700 size cell which is being sold as 5000mAh one while in its official datasheet the capacity is mentioned as "Min. 4900mAh". I've tested it to find out it's real capacity. The battery was bought from my reliable supplier ( Queen Battery ) and tested  with  ZKETECH EBC-A20  and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals I've followed all the prescriptions of the  IEC61960-2003  standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 23.0-24.5°C. To be sure in results i've done each test minimum twice (usually 3-4 times). S

3500mAh 18650 Li-ion cells' discharge capacity test (Sanyo NCR18650GA vs Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E)

Hi guys! I’ve got four 3500mAh batteries from top manufacturers. I’ve tested and compared them. I think it’s interesting not only for me, but also for you, the guy who is reading this:) The cells were bought from Queen Battery , a Chinese supplier of genuine batteries, who specializes mainly on EV and eBike market. Queen Battery has a branch in Europe, but they also work with customers from Americas, Russia, etc… As always, I've tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard current mentioned in its datasheet to 4.2V (cut-off at 0.1A, which is the lowest supported by EBC-A20). Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 20-

Samsung 40T - high drain 21700 Li-ion battery's capacity test

Hi guys! I've tested the Samsung INR21700-40T (35A) at up to 20A discharge (limited by my equipment). The battery was bought from my reliable supplier ( Queen Battery ) and tested  with  ZKETECH EBC-A20  and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals I've followed all the prescriptions of the  IEC61960-2003  standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 23.5-24.5°C. To be sure in results i've done each test minimum twice (usually 3-4 times). Samsung INR21700-40T The c ell is marked as  INR21700-40T SAMSUNG SDI 2I15 which mean s that the production d

Li-ion 21700: LG M50 5000mAh vs Samsung 48G 4800mAh discharge capacity test

Hi guys! I've tested two high capacity 21700 cells - LG M50 (5000mAh) and Samsung 48G (4800mAh). The latter i had already tested before and the re-testing of another cell showed almost no difference with previous test results. The M50 is a new cell which is being sold as 10A one, but in its datasheet the maximum discharge current is mentioned as 7.28A. Nevertheless i've also discharged it at 10A to look at it's behavior. The cells i've bought from Queen Battery . As always, I've tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used the v2.5 of my battery holder I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard current mentioned in its datasheet to charge end voltage (4.2V) (cut-off at 0.1A, which is th