Just giving my thoughts, but I’m no expert so just consider as reference…
I’ve gotten a pair of Vapcell G40 4000mAh 21700 (white wrapper) — this does not appear to be the same battery as the Samsung 40T, it’s heavier (~74 grams vs ~68 grams for Samsung 40T), and G40 has a slightly wider diameter (I measure 21.3-21.4mm for G40 vs the 21.0-21.1mm for 40T). Also, the top design is different (both are “3-lobes” but the lobe design is different enough).
With that said, I can’t reliably test if G40 performs similar or better/worse than 40T. Using YR1030 AC IR meter, I noted that the G40 has AC IR ~8.2mOhms while a 40T has ~8.8mOhms, so the G40 has a wee bit lower AC IR… this isn’t enough to prove anything though. Both are quite low IR though.
With regards to the discharge rating, I wouldn’t exactly trust the rating of the rewrapper, but instead check for 3rd-party technical reviews (eg. from HKJ or Mooch); unfortunately I also haven’t found info about the G40 (or F40) from either HKJ/Mooch…
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now regarding the battery to use on the FT02S and EA01 — these are what I think based on my experience with these 2 flashlights:
FT02S (quad XHP50.2 LEDs) can use a LOT of power (more than 20 Amps), so a (fully-charged) more “high-drain” or higher-discharge rating (real rating by discharge graph by 3rd-party reviewers like HKJ) battery could give it the most brightness (in this case, a 30T theoretically could give a bit more power than 40T, which gives a bit more power than the T50). Although in real life, temperature control and other factors may make the difference small, but the capacity (runtime) should be there… (higher capacity should have a bit longer runtime).
- EA01 (single XHP50.2) can also use a lot of power (a bit less than 20Amps), but most of the good 21700 batteries will probably just have a nearly similar effect. I would suggest a T50, but maybe another good 21700 battery like the G50 likely won’t be too different in performance compared to the T50.
Just giving my thoughts, but I’m no expert so just consider as reference…
I’ve gotten a pair of Vapcell G40 4000mAh 21700 (white wrapper) — this does not appear to be the same battery as the Samsung 40T, it’s heavier (~74 grams vs ~68 grams for Samsung 40T), and G40 has a slightly wider diameter (I measure 21.3-21.4mm for G40 vs the 21.0-21.1mm for 40T). Also, the top design is different (both are “3-lobes” but the lobe design is different enough).
With that said, I can’t reliably test if G40 performs similar or better/worse than 40T. Using YR1030 AC IR meter, I noted that the G40 has AC IR ~8.2mOhms while a 40T has ~8.8mOhms, so the G40 has a wee bit lower AC IR… this isn’t enough to prove anything though. Both are quite low IR though.
With regards to the discharge rating, I wouldn’t exactly trust the rating of the rewrapper, but instead check for 3rd-party technical reviews (eg. from HKJ or Mooch); unfortunately I also haven’t found info about the G40 (or F40) from either HKJ/Mooch…
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Thank you very much for your support to vapcell
The power performance of G40 is similar to that of Samsung 40t, but the capacity of G40 is higher, about 4100mah
If that cell underneath the wrap offers the same current specs like PowerLongBattery's PLB-55A cell (see Shockli 5500mAh or Keeppower 6000mAh), it would be really awesome.
At least I am most pleased to hear that 26650 battery development has not ended yet. PLB has given up producing the PLB-55A battery last year, so the only powerful 26650 battery left is Golisi S43 with only 4300mAh.
Me too, hope it comes to US. 26650 walking lights are my go to. I live in the boonies and like high lumens for my aging eyes. Long run times with this cell would be great.
And I see a new high capacity 18350. I prefer higher discharge current at this size so I’m not in but still I am happy to see an improvement in this format.
The K64's finally arrived at home - hope to charge them up this eve.
Update:
Charged up the cells, and based on the starting level and how much mAh's they took, the capacity sounds about right. They also performed well in running some simplistic tests, measuring initial amps on some higher powered single 26650 lights.
on a stock FT03 XHP50.2: K64 at 4.21v: 16.0A, GOLISI 26650 @4.21v: 14.5A
on a Emisar D4SV2: K64 at 4.21v: 16.9A, GOLISI 26650 @4.21v: 14.6A
on modded Haikelite HK4S: K64 at 4.21v: 21.2A, SHOCKLI 5500 @4.21v: 18.0A
on modded brass MF01 mini:K64 at 4.21v: 24.1A, 40T @4.20v: 25.0A
Still want to do capacity tests on my chargers, two SKYRC MC3000's. The GOLISI's are not new, but shouldn't be heavily used, but still may not be a valid comparison, and limited test of simple initial amps.
Appears so far to be a solid candidate for best all around 26650 cell, great capacity, excellent performance.
Thanks a lot for testing Tom E! I am surprised that K64 even surpasses the PLB 55A cell underneath the Shockli 5500 wrap, being so close to the power of a Samsung 40T. Since the 21700 battery makes more spring compression in the MF01 mini, the K64 battery could be even in line with the 40T if contact resistance is disregarded. This is fantastic news, especially since PLB once announced they would discontinue their 55A cell. :-) I look forward to seeing your capacity tests.
Maybe HKJ can also do some tests under heavy load (10A, 20A, 30A).
Is it still not possible to consolidate shipping fees on the Aliexpress store ? last time I asked they didn’t want to. So we have to pay 3.98USD of shipping per item…
If I order 2x L10 shipping is 3.98, if I order 4x L10 it’s 3.98, if I order 2x L10 + 2x H10 it’s 7.96 even though it’s the same weight as 4x L10.