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#4593075 - 12/03/17 01:52 PM Charging...... Lithium-ion batteries (Li-ion)
Warstud Offline


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
When do you charge your devices that use Li-ion batteries?

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#4593087 - 12/03/17 02:11 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
JHZR2 Offline



Registered: 12/14/02
Posts: 41768
Loc: New Jersey
Li-ion batteries get maximum cycle life when the batteries are kept in the narrowest state of charge range possible. That usually also means some middle of the road state of charge. Oxidation is more likely to occur at high state of charge, and some protective circuits won't allow charging if a battery discharges (use plus self discharge) too low.

It is important to fully discharge and fully charge from time to time, to help calibrate the algorithms and Management systems. Some batteries also balance cells, and that often needs a pack to be topped up.

I leave my tool batteries partially charged as much as possible. I don't let them go too low, but also don't let them go too high needlessly.

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#4593100 - 12/03/17 02:23 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
Kamele0N Offline


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
They are best when charging between 40-80%......you have to discharge them completely from time to time just to re-calibrate them.

For a long term storage......leave battery @40%
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#4593104 - 12/03/17 02:26 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
JC1 Offline


Registered: 11/29/08
Posts: 3001
Loc: Oshawa, Ontario Canada
Depends on how many of them I have.

For my dewalt 20v tools, I have 7 different Li-ion batteries. I could let them run down before recharging. My oldest Dewalt 20V batteries are from 2011 and are working fine.

Other things like floor sweepers, I may top up the charge when I can tell it's running low.

I do believe that all these batteries should be run down from time to time before recharging.
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#4593141 - 12/03/17 03:06 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
demarpaint Offline


Registered: 07/03/05
Posts: 29745
Loc: NY
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?
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#4593143 - 12/03/17 03:08 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
dishdude Offline


Registered: 11/14/08
Posts: 8732
Loc: Phoenix
How does cell phone fast charging impact longevity? I have an S7, it's crazy how fast it will charge if you turn that option on. I'm thinking it can't be good for battery health so I try not to use it.
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#4593162 - 12/03/17 03:37 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: demarpaint]
Warstud Offline


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
Originally Posted By: demarpaint
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?


I just un-packaged a new 18650 battery I had for my flashlight and put it on the charger and it showed it was very low. So I would say go ahead and charge it up.

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#4593186 - 12/03/17 04:17 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: dishdude]
raytseng Offline


Registered: 12/11/08
Posts: 2333
Loc: CA
Originally Posted By: dishdude
How does cell phone fast charging impact longevity? I have an S7, it's crazy how fast it will charge if you turn that option on. I'm thinking it can't be good for battery health so I try not to use it.


The reason why the fast charging on galaxy is fine is because the battery and electronics is natively 9v battery and not the 3.7/4.2 that matches the standard usb spec. If anything charging natively should be better as you don't need to use the extra circuitry to
step up the voltage.

If you want to maximize your battery wear,you are better off spending your effort to disconnect charging when you hit 80 to 90% rather than letting it go to 100%.


Edited by raytseng (12/03/17 04:17 PM)

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#4593241 - 12/03/17 04:53 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
raytseng Offline


Registered: 12/11/08
Posts: 2333
Loc: CA
im actually wrong above. please ignore

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#4593251 - 12/03/17 04:57 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
demarpaint Offline


Registered: 07/03/05
Posts: 29745
Loc: NY
Originally Posted By: Warstud
Originally Posted By: demarpaint
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?


I just un-packaged a new 18650 battery I had for my flashlight and put it on the charger and it showed it was very low. So I would say go ahead and charge it up.


I was looking to keep it as a back up, I have three of them, and only need two at the moment. Or is leaving it as new and unused bad for it?
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#4593391 - 12/03/17 07:18 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: demarpaint]
Warstud Offline


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
Originally Posted By: demarpaint
Or is leaving it as new and unused bad for it?


I doubt removing it from it's package will hurt anything. But put it on a charger and see what it says. What are the batteries for ? and what info does the charger give you...Volts or percentage charged.

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#4593479 - 12/03/17 08:48 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: demarpaint]
JHZR2 Offline



Registered: 12/14/02
Posts: 41768
Loc: New Jersey
Originally Posted By: demarpaint
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?


Depends upon how long is long. Regulations require them to be shipped around 30% charge. If you figure they lose 1-2% per month, go much beyond that and it may not be able to accept a charge any more.

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#4593481 - 12/03/17 08:50 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: demarpaint]
JHZR2 Offline



Registered: 12/14/02
Posts: 41768
Loc: New Jersey
Originally Posted By: demarpaint
Originally Posted By: Warstud
Originally Posted By: demarpaint
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?


I just un-packaged a new 18650 battery I had for my flashlight and put it on the charger and it showed it was very low. So I would say go ahead and charge it up.


I was looking to keep it as a back up, I have three of them, and only need two at the moment. Or is leaving it as new and unused bad for it?


It's not bad for it really, but they will calendar age and lose capacity and power performance regardless of if it's used.

If you wanted to store it, I'd add a few percent SOC and store it in a refrigerator.

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#4593608 - 12/04/17 12:25 AM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: Warstud]
SubLGT Offline


Registered: 01/31/06
Posts: 2646
Loc: Idaho
Originally Posted By: Warstud
When do you charge your devices that use Li-ion batteries?


This blog article from a battery researcher at Argonne National Labs is worth reading:

http://thisweekinbatteries.blogspot.com/2016/11/tips-on-extending-battery-life-from.html

Quote:
Donít charge them too high
Donít swing them too wide
Keep the temperature low to extend their life.

Just to be clear: These rules are for Li-ion batteries; for phones, laptops, cars etc. Not for other kinds of batteries. And not for every Li-ion battery known either; but the most popular ones.

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#4594216 - 12/04/17 05:18 PM Re: Charging...... Lithium-ion batteries (Li-ion) [Re: JHZR2]
demarpaint Offline


Registered: 07/03/05
Posts: 29745
Loc: NY
Originally Posted By: JHZR2
Originally Posted By: demarpaint
Originally Posted By: Warstud
Originally Posted By: demarpaint
Can a new Li-ion battery be left as is for a long period of time w/o removing it from its original packaging and charging it?


I just un-packaged a new 18650 battery I had for my flashlight and put it on the charger and it showed it was very low. So I would say go ahead and charge it up.


I was looking to keep it as a back up, I have three of them, and only need two at the moment. Or is leaving it as new and unused bad for it?


It's not bad for it really, but they will calendar age and lose capacity and power performance regardless of if it's used.

If you wanted to store it, I'd add a few percent SOC and store it in a refrigerator.


Thanks, I might just rotate it in.
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