Unique, odd stuff. If these are at least as good as the existing 14500/10440 LiFePO4 cells, capacity should be close to 350mAh, with up to 10C discharge rate.
I know this may be meant for photographic devices, yet I'm pretty sure a couple could be stuck in certain “14500” flashlights. Just curiosity.
I despise the “state of the art” in rewrapping technology (LoL!). The big cell manufacturers discredit themselves often also, even if to a considerably lesser extent. In my opinion, there's no good reason to put a never met specification on a label. There are some batteries which live up to their label specs, something esteem deserving.
I believe we should doubtlessly and respectfully point at the blamers.
I believe you are (also) talking about the cells I’ve posted above, right Barkuti? I also think they must be rewrapped, in the best of chances, some Sanyo with protection board, maybe!
Despite I agree with you on the “descrediting” of the original manufacturers, I can’t let myself forget that I’m a final user of a long chain, and that if a product is good at a lower price, I’ll try to grab what I need! Even if the “credits” for the core material go to others than those who sold me the “end product”.
Whenever I can, I buy “original” stuff , though!
Thanks HKJ and I’ll be looking for the tests! I ended up buying 2 of those 14500s, as I needed 2, despite being good or not so good
I wish you could add a filter to your battery comparator site.
Instead of just have them in alphabetical order you could have capacity and high current order.
It would help alot as you still testing cells and the list just grows longer.
This one don’t have free shipping but gets really cheap when buying a few (postage doesn’t go up so much when adding more of them, less then double the postage when buying 12 of em Vs buying 1)
For this price, I would call them neither cheap, nor expensive.
I ordered one 8pcs set of these batteries, and I did a CDC test for capacity and IR with my Miboxer C2-4000 charger, which resulted the following: 1. 984mAh, 59mOhm; 2. 981mAh, 68mOhm; 3. 1004mAh, 56mOhm; 4. 963mAh, 66mOhm; 5. 973mAh, 73mOhm; 6. 970mAh, 55mOhm; 7. 982mAh, 57mOhm; 8. 960mAh, 57mOhm.
I think, these values are pretty good, when considering, the test was made just after opening the package, and found them at around 1.24V (I did no charge/discharge cycles prior to this test), AND, the discharge measurement was not on a minimal current, but the current the Miboxer C2-4000 offered for the test.
Also, I had a similar test run on these batteries:
While my test results were somewhat short of the declared capacity, I think, they are also not bad: 1. 2318mAh, 47mOhm; 2. 2358mAh, 48mOhm; 3. 2357mAh, 47mOhm; 4. 2346mAh, 48mOhm; 5. 2348mAh, 48mOhm; 6. 2334mAh, 48mOhm; 7. 2355mAh, 46mOhm; 8. 2354mAh, 49mOhm.
After seeing these results, I ordered a small pile of these batteries, too (just a few days ago):
I have one low temperature LiIon battery in queue and am thinking about if I can do any test in the fridge/freezer. They will have to be manual with the equipment standing outside. This also means I will only be testing at one or two currents, maybe 1A and 3A would be fine?
Review quote with Google translation and the pictures which matter to us:
• Аккумуляторы просто супер. Емкость чуть меньше заявленной, но они ещё должны раскачаться. Лучше не нашел. Упаковка просто супер: Пупырка + пластиковый бокс + пупырка + Картонная коробка Доставка очень быстрая: с момента заказа до получения - 14 дней. Продавец общительный, на вопросы отвечает.
• The batteries are just super. The capacity is slightly less than the claimed capacity, but they should still be swinging. I did not find it better. The packaging is just super: Puppy + plastic box + papyrka + Cardboard box Delivery is very fast: from the time of ordering to receiving - 14 days. The seller is outgoing, the questions are answered.
I see now that the “2pcs li ion 14500 rechargeable Genuine 14500 battery 3.7v 700mah high drain 12A” looks exactly like the “Hibatt IMR14500 700mAh (Orange)” that you already have tested except that they have removed the Hibatt name.
It’s even sold by the same aliexpress store that you bought your Hibatt cells.
Fridge, Agro? HKJ lives in Denmark and by the time he gets the low temperature batteries he may already be seeing some nice sub-zero celsius temperatures on street thermometers. He'll just load some equipment on his van and that's about it. ;-)
My test equipment lives best at around 25C and living in an apartment I am not going to draw wires out a open window to test anything outside when it is cold.
Fridge is the best solution, but I need to get some test equipment together (I will not take down any of my regular test stations, i…e I have to use some spare equipment).
Alot of text but does this apply to high drain cells to?
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Low temp
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Li ion can be fast charged from 5°C to 45°C (41 to 113°F). Below 5°C, the charge current should be reduced, and no charging is permitted at freezing temperatures because of the reduced diffusion rates on the anode. During charge, the internal cell resistance causes a slight temperature rise that compensates for some of the cold. The internal resistance of all batteries rises when cold, prolonging charge times noticeably.
Many battery users are unaware that consumer-grade lithium-ion batteries cannot be charged below 0°C (32°F). Although the pack appears to be charging normally, plating of metallic lithium can occur on the anode during a sub-freezing charge. This is permanent and cannot be removed with cycling. Batteries with lithium plating are more vulnerable to failure if exposed to vibration or other stressful conditions. Advanced chargers (Cadex) prevent charging Li-ion below freezing.
Advancements are being made to charge Li-ion below freezing temperatures. Charging is indeed possible with most lithium-ion cells but only at very low currents. According to research papers, the allowable charge rate at –30°C (–22°F) is 0.02C. At this low current, the charge time would stretch to over 50 hours, a time that is deemed impractical. There are, however, specialty Li-ions that can charge down to –10°C (14°F) at a reduced rate.
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High temp
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Lithium-ion performs well at elevated temperatures but prolonged exposure to heat reduces longevity. Charging and discharging at elevated temperatures is subject to gas generation that might cause a cylindrical cell to vent and a pouch cell to swell. Many chargers prohibit charging above 50°C (122°F).
Some lithium-based packs are momentarily heated to high temperatures. This applies to batteries in surgical tools that are sterilized at 137°C (280°F) for up to 20 minutes as part of autoclaving. Oil and gas drilling as part of fracking also exposes the battery to high temperatures.
Capacity loss at elevated temperature is in direct relationship with state-of-charge (SoC). Figure 5 illustrates the effect of Li-cobalt (LiCoO2) that is first cycled at room temperature (RT) and then heated to 130°C (266°F) for 90 minutes and cycled at 20, 50 and 100 percent SoC. There is no noticeable capacity loss at room temperature. At 130°C with a 20 percent SoC, a slight capacity loss is visible over 10 cycles. This loss is higher with a 50 percent SoC and shows a devastating effect when cycled at full charge.