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Any "ordinary" Lithium Ion or Li-PO battery will last a long time if it is stored at half-charge (3.7V to 3.8V) and is not charged and discharged more than about 500 times.
Lookup battery details at www.batteryuniversity.com .
If a Lithium battery is fully charged all the time it will not last long. If the battery is discharged below about 3.2V then it will not last long. If it is discharged below about 2.5V then it is permanently ruined.
They say to charge it every 3 months maybe because it powers something that is running all the time like a clock, or because they wan't to sell you a new battery soon..
If a Lithium battery is fully charged all the time it will not last long. If the battery is discharged below about 3.2V then it will not last long. If it is discharged below about 2.5V then it is permanently ruined.
They say to charge it every 3 months maybe because it powers something that is running all the time like a clock, or because they wan't to sell you a new battery soon..
What percentage of the battery can I recharge without damaging its life? between 50 and 90%?
the equipment is a plasma pen and they say to charge every 3 months but I don’t know if it will charge up to 100%, plasma pen doesn’t use a clock and doesn’t power anything when it’s turned off
the equipment is a plasma pen and they say to charge every 3 months but I don’t know if it will charge up to 100%, plasma pen doesn’t use a clock and doesn’t power anything when it’s turned off
bertus
Moderator
Hello,
From the give page in post # 16:
Most Li-ions charge to 4.20V/cell, and every reduction in peak charge voltage of 0.10V/cell is said to double the cycle life. For example, a lithium-ion cell charged to 4.20V/cell typically delivers 300–500 cycles. If charged to only 4.10V/cell, the life can be prolonged to 600–1,000 cycles; 4.0V/cell should deliver 1,200–2,000 and 3.90V/cell should provide 2,400–4,000 cycles.
On the negative side, a lower peak charge voltage reduces the capacity the battery stores. As a simple guideline, every 70mV reduction in charge voltage lowers the overall capacity by 10 percent. Applying the peak charge voltage on a subsequent charge will restore the full capacity.
In terms of longevity, the optimal charge voltage is 3.92V/cell. Battery experts believe that this threshold eliminates all voltage-related stresses; going lower may not gain further benefits but induce other symptoms. (See BU-808b: What causes Li-ion to die?) Table 4 summarizes the capacity as a function of charge levels. (All values are estimated; Energy Cells with higher voltage thresholds may deviate.)
Bertus
From the give page in post # 16:
Most Li-ions charge to 4.20V/cell, and every reduction in peak charge voltage of 0.10V/cell is said to double the cycle life. For example, a lithium-ion cell charged to 4.20V/cell typically delivers 300–500 cycles. If charged to only 4.10V/cell, the life can be prolonged to 600–1,000 cycles; 4.0V/cell should deliver 1,200–2,000 and 3.90V/cell should provide 2,400–4,000 cycles.
On the negative side, a lower peak charge voltage reduces the capacity the battery stores. As a simple guideline, every 70mV reduction in charge voltage lowers the overall capacity by 10 percent. Applying the peak charge voltage on a subsequent charge will restore the full capacity.
In terms of longevity, the optimal charge voltage is 3.92V/cell. Battery experts believe that this threshold eliminates all voltage-related stresses; going lower may not gain further benefits but induce other symptoms. (See BU-808b: What causes Li-ion to die?) Table 4 summarizes the capacity as a function of charge levels. (All values are estimated; Energy Cells with higher voltage thresholds may deviate.)
Bertus
This seems strange to me, what phones used Li-Ion 22 years ago? IIRC most were NiMH at the time.
Overall this topic looks like another one of those OCD, how-can-I-make-everything-last-forever, misadventures. Consumer access to a wide variety of Li-Ion pack sizes is much better on the internet today, so the question becomes how much work to put into storage, checking voltage, monitoring and prematurely terminating charge voltage, over and over for years, to save from buying a replacement battery when we're talking about % changes here so you may end up buying a replacement battery anyway because nothing lasts forever, AND given enough time, there may be a newer better version of the widget you're trying to make last forever.
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^ No, never charge it to 100% except to USE it enough that it drops to under 70% at the point of storage again, which may mean don't charge it to 100% at all if your use doesn't drain it that much.
Charge to closer to 40% to 70% (lower giving longer total lifespan) for storage and yet, this means you must check the storage voltage that much more often because the less total charge it has, the sooner it self discharges too low. If you want to be further obsessive, also store it near freezing. Seal it in an air tight bag and stick in the colder section of your refrigerator, though Li-Ion freezing point is well below the low temperature achieved by a typical consumer freezer too. If you store them that cold, leave them in a sealed container with minimal air in it (plastic baggie evacuated of most excess air) so it doesn't get condensation while it warms up near room temperature before use.
WHY are you asking here? This info is out there and easy to find with a web search.
Charge to closer to 40% to 70% (lower giving longer total lifespan) for storage and yet, this means you must check the storage voltage that much more often because the less total charge it has, the sooner it self discharges too low. If you want to be further obsessive, also store it near freezing. Seal it in an air tight bag and stick in the colder section of your refrigerator, though Li-Ion freezing point is well below the low temperature achieved by a typical consumer freezer too. If you store them that cold, leave them in a sealed container with minimal air in it (plastic baggie evacuated of most excess air) so it doesn't get condensation while it warms up near room temperature before use.
WHY are you asking here? This info is out there and easy to find with a web search.
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The lithium polymer battery of the plasma pen I checked and has an output power of 5V / 1A 5W
I bought the device, but it hasn't arrived at my house yet, but I'm going to use it and store it and I think it will be delivered with a 100% full battery
In the manual it says to recharge at once in 3 months but it doesn't say to charge to 100%
A lithium polymer battery cell is 4.20V when fully charged. A new version is called Graphene and its fully charged voltage is a little higher.
Your 5V/1A 5W is not the battery, instead it is the output from the power supply that heeds the charger circuit for the battery.
Or maybe you have a "power bank" that is charged from 5V and it has a voltage boosting circuit that produces a 5V output.
Your 5V/1A 5W is not the battery, instead it is the output from the power supply that heeds the charger circuit for the battery.
Or maybe you have a "power bank" that is charged from 5V and it has a voltage boosting circuit that produces a 5V output.
Dave has given you the answer in post #31.
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