Author: John Muchow

Bottom Line: This Turnigy is an average performing pack but is overrated. At 36A (20C), Turnigy’s continuous current rating, it reached about 10°C over the pack assembler’s limit and was puffed by a decent amount (temporarily) indicating that the cells were being overstressed. This cannot be considered a 20C continuous-rated pack.

Vaping at its 72A (40C) “pulse” rating would quickly bring the pack voltage down to about 10V and quickly heat the pack up past Turnigy’s max temperature rating unless vaping quite slowly. This cannot be considered a 40C pulse-rated pack.

CAUTION: LiPo’s use the most volatile of the Li-Ion battery chemistries and can cause extreme injury if abused. Never use a LiPo unless the cells, wraps, wiring, and connector are in perfect condition. Never exceed the CDR of the LiPo unless you accept the risks involved. You are responsible for your own safety, be careful!
My Ratings:
– Capacity = 1800mAh
– Continuous Discharge Rating (CDR) = 20A (11C)
– Average Pack IR = 19.6 mOhms
– Average Cell IR = 5.1 mOhms

IR = Internal Resistance
mOhms = milliohms

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/turnigy-20c-40c-1800mah-3s-lipo-pack-bench-test-results-only-an-11c-22c-pack.794103/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

Bottom Line: This Enook is preposterously overrated. At 35A, this cell’s rating, it ran for less than one second before plunging to 3.2V. Enook did the same kind of overrating with their 40A 3200mAh cell. These two are among the most overrated cells I have ever seen.

This Enook’s appearance is identical to the 10A 3300mAh Panasonic NCR18650GA but it has a lower capacity than the Panasonic and performs a bit worse. It could be a lower grade NCR18650GA.

I am rating this Enook at 10A and 3200mAh.  The 18650 ratings table has been updated to include this cell.

IMPORTANT:
– There is no 18650 that can have a factory/manufacturer rating over 30A.

– There is no 3000mAh 18650 that can have a rating over 20A.

– There is no 3100mAh-3500mAh 18650 that can have a rating over 10A.

– There is no 18650 with a capacity rating over 3600mAh.

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/enook-35a-3600mah-18650-bench-test-results-a-shamefully-overrated-10a-battery.786197/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447

Bottom Line: This “40A” Enook has a ludicrously exaggerated current rating and an exaggerated capacity rating, it is only a 10A 3000mAh cell. At 40A continuous, it delivered only 31mAh down to 3.2V.

Basen did the same overrating with their 40A 3200mAh cell but they used a rewrapped Panasonic. Both cells are among the most overrated I have ever seen…shameful.

This Enook’s appearance is identical to the 10A 3200mAh LG MH1 but it has a lower capacity than the MH1 and performs worse. It seems to be a lower grade MH1.

I am rating it at 10A and 3000mAh. The 18650 ratings table has been updated to include this cell.

IMPORTANT:
– There is no 18650 that can have a factory/manufacturer rating over 30A.

– There is no 3000mAh 18650 that can have a rating over 20A.

– There is no 3100mAh-3500mAh 18650 that can have a rating over 10A.

– There is no 18650 with a capacity rating over 3600mAh.

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/enook-40a-3200mah-18650-bench-test-results-only-10a-shame-on-you-enook.786067/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447

Bottom Line: This cell has an absurdly exaggerated current rating and an exaggerated capacity rating. Its appearance is identical (except as noted below) to the LG HG2 but this Enook has a higher internal resistance and performs worse.

Like the 3000mAh Enook this cell seems to be a rewrapped lower grade HG2 except that the center of the bottom of this cell is polished. I cannot explain why. I’ve never seen that before on any other cell.

As shown in the discharge graph below it performs almost identically to the 3000mAh Enook but worse than the HG2. I am rating this Enook at 20A and 3000mAh but it sags more than the HG2, delivering about 10% less capacity. The 18650 ratings table has been updated to include this cell.

IMPORTANT:
– There is no under-3000mAh 18650 that can have a rating over 30A…none.

– There is no 3000mAh 18650 that can have a rating over 20A….none.

– There is no 3100mAh-3500mAh 18650 that can have a rating over 10A…none.

– There is no 18650 with a capacity rating over 3500mAh…none.

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/enook-40a-3100mah-18650-bench-test-results-just-20a-and-same-as-enook-3000mah-battery.785919/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447

Bottom Line: This is a poor performing cell with an exaggerated current rating. When discharged continuously at its claimed 40A rating (down to 3.2V) it only delivered 14mAh. Yes, only 14mAh.

Its appearance is identical to the LG HG2 but the Enook has a higher internal resistance and performs worse. It seems to be a rewrapped lower grade HG2.

I am rating this Enook at 20A and 3000mAh but it sags more than the HG2, delivering about 10% less capacity. The 18650 ratings table has been updated to include this cell.

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/enook-40a-3000mah-18650-bench-test-results-laughably-overrated-a-lower-grade-20a-battery.785759/#post-19114897

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447

Bottom Line: This is a very poor performing cell with exaggerated current and capacity ratings. It has only 1/2 the capacity (684mAh) of the Samsung 25R5 (1350mAh) at 20A continuous down to 3.2V due to the large amount of voltage sag. When discharged continuously at its claimed 40A rating it almost instantly dropped to just above 3.0V and reached my 2.8V cutoff a few seconds later.

Its appearance doesn’t match any Samsung/Sony/LG/Panasonic/Sanyo cell I have and appears to be of Chinese manufacture. It has the classic roughly done top crimp of many cells made in China. Both of the cells I tested had signs of improper storage (rust).

I am rating this Enook at 20A and 2400mAh but it sags badly. The 18650 ratings table has been updated to include this cell.

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/enook-40a-2600mah-18650-bench-test-results-ridiculously-overrated-poor-performing-20a-battery.785661/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/

18650 current ratings and safety grades: https://www.e-cigarette-forum.com/forum/blog-entry/18650-safety-grades-picking-a-safe-battery-to-vape-with.7447

The results will be posted this week.

If you live in the US or EU you might be thinking “E-who?”. They’re only sold by a couple of vendors outside of Asia but they are very popular batteries in a couple of countries.

Due to their lack of availability in the US and EU it took months to get the six sets of batteries I tested. Several weeks were spent trying to contact Enook and purchase samples from their Alibaba page, with no luck. I’d like to thank Regi SweetVippie Amos for donating the 3100mAh 18650’s and Sam Gibbs and Michael Hall for helping me to purchase the rest and shipping them to me from outside the US.

Thank you!

Among other issues, one battery supplier made the case too small and the other supplier had poor quality welds.

http://arstechnica.com/gadgets/2017/01/galaxy-note-7-investigation-blames-small-battery-cases-poor-welding/

https://news.samsung.com/us/Samsung-Electronics-Announces-Cause-of-Galaxy-Note7-Incidents-in-Press-Conference

Some very interesting tidbits of info regarding the specs for upcoming 20700 and 21700 battery releases:

http://www.emove360.com/wp-content/uploads/2016/11/1120evtl-LIB-18650-Cells-New-Replacement-Cylindrical-Cell-Sizes-20650-20700-21700-Report-ver-3-presentation-for-conferences.pdf

Bottom Line: The Sanyo 20700A is the second newly available 20mm x 70mm cell I have tested. The first was the 20700B (https://www.e-cigarette-forum.com/forum/threads/sanyo-20700b-4000mah-20700-bench-test-results-a-peek-at-the-future.775809/), a great high capacity cell I rated at 15A 4000mAh. At 10A-15A it runs about 25% longer than the LG HG2.

This 20700A is a true high performance cell that I am rating at a cool-running 30A 3100mAh. It performed well against the top 18650 cells for performance, vaping time, and safety (high amp rating). The 20700A…

…hits as hard as the Sony VTC5A at the start and easily holds its voltage up higher for considerably longer.

…runs 5°C cooler than the LG HB6 at 20A continuous and for about 230% longer. Yes, 230%.

While this cell will only fit in a custom battery sled it did just fit in the Xtar and Efest chargers I tested it in. I cannot say if it will fit in any 18650 charger. Otherwise it’s charged at 4.2V just like our 18650’s. It’s “standard” charging rate is 2.2A so 2A charging is no problem and won’t decrease its overall life.

Here’s the datasheet: https://www.imrbatteries.com/content/sanyo_ncr20700a.pdf

The two cells I tested were donated by IMRBatteries (www.imrbatteries.com). Thank you!

Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/sanyo-20700a-30a-3100mah-20700-bench-test-results-a-great-performing-30a-3100mah-battery.784543/

All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/