1327-1400 mAh is the most I’ve seen from a 14500, but falls short of the claimed 1500. I’ll try a runtime comparison in an actual flashlight.
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I put it in an Acebeam Pokelit Ti and the result was a decent increase in runtime: 190 minutes instead of 166.
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Yesterday I saw result of one capacity test of these cells made with Vapcell S4+ and it came out 1524mAh.
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I don’t know much, but 3 things occur to me:
- There’s a fair bit of variance between different charger/analyzers. I’ve noted that when I’ve compared them, my BT-C3100 will typically report capacities ~6-7% higher than my SkyRC MC3000 (w/Li-ion).
- VC capacity spec is tested to discharge cutoff voltage of 2.5V, but I believe the Opus terminates at 2.8V.
- VC lists the typical capacity at 1500, but Min capacity at 1150, both at.2C discharge.
There are some variables to consider, and your numbers may not be of much concern.
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That claim of 1150min, 1500typ seems weird to begin with, way, way too high expected variation which is bad by itself.
Also when comparing cells in the same conditions - same charger, same current, same cutoff - results should be comparable. F12 showing 1300-1350 and F15 - 1350-1400 feels… underwhelming.
Especially knowing that charger i am testing with does report a bit higher than actual capacity, so judging by results with other cells F12 is probably around its rated ~1250 and F15 is proportionally lower too…
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Are these non-protected? Original web page description is confusing to say the least.
thank you
May I ask if you are purchasing the button top of the battery? There may be some loss in capacity, and the voltage will be lower during discharge
This battery is brand new and has been tested by high-end analytical instruments in the factory to have a capacity of around 1500mAh
Suggest using a flat top F15 test and reducing the discharge current to around 300ma with a cut-off voltage of 2.5V
thank you
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These four are unprotected button tops purchased from Convoy.
The Opus is, of course a low-cost analyzing charger, not a calibrated DC load. I do find its readings are usually around what I expect to see though.
I am not buying at the moment, I have my F12 on the way. I just want to know if there protected option for purchase. As I understand from your reply “protected” option is available however it has lower voltage and capacity?
“Min. Capacity : 1150mAh” does not refer to the F15 but to the F12 …
for the homepage of the new F15 they first just copied & pasted the specifications of the F12 there and only changed “Typical Capacity: 1250mAh” into 1500 mAh …
the rest of the specs is absolutely identical to the F12, every tenth of a millimeter, every gramm, every milliohm is exactly the same, at this moment …
maybe they will correct this within some time, now that Dennis is online again here, after a while …
in the test by HKJ the Opus BT-C3100 (V2.1) discharged down to 2.9V during the cap test, whereas the Vapcell S4+ discharges down to 2.5V, which presumably is the discharge cut off voltage of the F15 … that could be one of the reasons for different results with the two chargers, besides different discharging currents, different contact resistances or different adjustments of the chargers due to construction …
I, too, saw results above 1500 mAh with the S4+ …
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Regardless of true repeatable capacity these are way higher than any 14500 currently in usage here at the ranch.
The more important question is, Is the new model better than the one it is replacing on being shown as an improved model?
The Opus readings and others on consumer based equipment should only be used as a guide and not a Bible. A good ballpark figure is fine.
Specs are for the dealer propaganda, usage in the field is the true measure.
Will be trying these out if not too pricey.
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They’re just over $5 from Convoy if you buy four. Mine even came with free flashlights, which look to be worth every bit of their price.
I do recommend them. Even if the capacity is a bit less than advertised, it’s higher than anything else.
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VapCell F15
- measured on BT-C3100, 500mA charge and 500mA discharge
1383 mAh and 1390 mAh - measured on Vapcel BL4, 500mA charge and 500mA discharge to 2.55V, time 3h:08m
1576 mAh and 1566mAh - measured on ISDT C4 Evo, discharge to 2.5V. Very strange results.
- 636 mAh and 646 mAh with 500/500 current
- 931 mAh and 959 mAh with 500 charge and 300 discharge, time 3h22m.
Interesting. Do you know what discharge voltage the BT-C3100 bottomed out at?
No, but I’m planning to do some more experiments, so I’ll try to see what 3100 shows during discharge. I also have F12 stuck in mail due to CandaPost strike, I’m planning to run same tests with F12s.
It is 2.8V.
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Just a little side FYI: In case it’s of any interest, I use a BT-C3100 V2.2 and an MC3000 w/ FW V1.15. When I check Li-ion discharge capacity with the same cell, after being fully charged w/ the same charger, w/ the MC3000 set at discharge cutoff of 2.8V (which is same as the Opus uses), and at the same discharge current, the measurement of the Opus will generally be ~6-7% higher capacity than when measured w/ the SkyRC. That’s the ~conversion factor I use when comparing capacity measurements from the two devices.
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Well, ~6-7% I would say for consumer grade devices is fine. But with C4 Evo, for example I get absolutely crazy number, while actually sticking to manufacturer provided conditions (discharge 0.2C = 300mA, 2.5V cut off) - ISDT C4 Evo experiences, fan noise. - #53 by Horilka
I finally got my F12s, so I used this chance to compare them with F15 on three chargers:
F15 vs F15
ISDT - charge 500mA, discharge 300mA, 2.5V cut-off
#1 F15 charged 1208mAh, discharged 724mAh
#2 F15 charged 1235mAh, discharged 737mAh
#3 F12 in 1120, out 699mAh
#4 F12 in 1095, out 649mAh
BL4 - charge / discharge 500mA, 2.5-2.6V (???) cut-off
#1 F15 1570mAh
#2 F15 1602mAh
#3 F12 1331mAh
#4 F12 1326mAh
BT-C3100 charge / discharge 300mA, 2.8V cut-off
#1 F15 1338mAh
#2 F15 1349mAh
#3 F12 1199mAh
#4 F12 1194mAh
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