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| Don't keep fully charged Li-Ion in long term storage, they tend to bulge |
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| Siwastaja:
Slight puffing seems to happen to almost any old cell. The difficulty is defining what is too much and how dangerous it is. I have never seen good data about this, it's all hand-waving, even among experts. With hard-cased cells like 18650, you just can't see the internal pressure rise equivalent to this "slight puffing". When the pressure rises too much, the safety went (CID) disconnects the internal cell from the terminals, so the choice is made for you and the level of "puffing" hidden. |
| SiliconWizard:
--- Quote from: Siwastaja on January 20, 2023, 08:10:45 am ---Slight puffing seems to happen to almost any old cell. The difficulty is defining what is too much and how dangerous it is. I have never seen good data about this, it's all hand-waving, even among experts. With hard-cased cells like 18650, you just can't see the internal pressure rise equivalent to this "slight puffing". When the pressure rises too much, the safety went (CID) disconnects the internal cell from the terminals, so the choice is made for you and the level of "puffing" hidden. --- End quote --- Yep and yep. All in all, when we finally switch to a different battery technology on a large scale, I won't miss Li-ion. One bit. |
| james_s:
I'm not too confident that we will switch to a different battery tech. I recall reading that the properties of lithium are about as ideal as we're going to get as far as energy density, there is nowhere else to go up the periodic table, lithium is already the lightest metal. I'm sure batteries will continue to improve and we will probably see other types with other advantages but in terms of raw energy density I'm skeptical. |
| Siwastaja:
--- Quote from: SiliconWizard on January 20, 2023, 09:00:57 pm ---All in all, when we finally switch to a different battery technology on a large scale, I won't miss Li-ion. One bit. --- End quote --- Yeah, but to be fair, having seen the transition from lead acid, NiCd and NiMH to li-ion, I won't miss any of them. One bit. |
| IanB:
--- Quote from: Siwastaja on January 21, 2023, 08:26:13 am --- --- Quote from: SiliconWizard on January 20, 2023, 09:00:57 pm ---All in all, when we finally switch to a different battery technology on a large scale, I won't miss Li-ion. One bit. --- End quote --- Yeah, but to be fair, having seen the transition from lead acid, NiCd and NiMH to li-ion, I won't miss any of them. One bit. --- End quote --- The major problem I have with Li-ion is the way the batteries tend to be embedded within the device and charged in place, rather than being removable. This is why I still very much like devices that take AA or AAA cells, since when the batteries are low I can simply swap them for fresh ones and put the depleted ones on charge. With lithium batteries, when the battery is low I have to plug the device into a charger and wait an hour or more for it to recharge. And when the battery wears out the whole device is often thrown away. I understand that some very small devices take advantage of the embedded battery for the form factor, but I still find the overall trend to be a loss of convenience. |
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