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PostPosted: Wed Mar 23, 2011 10:05 am 
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I recently purchased two batteries (one brand-new) for my T30.

I charged one up to 2% (and left the other at 0%) and placed in my kitchen refridgerator.

Should I store them fully charged?
Should I store them fully discharged?

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PostPosted: Wed Mar 23, 2011 11:35 am 
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most places i've read suggest 40% charge for long-term storage.

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PostPosted: Wed Mar 23, 2011 4:11 pm 
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sarbin wrote:
most places i've read suggest 40% charge for long-term storage.


Ditto, I've read the same. Apparently Lith-Ion batteries will chemically degrade if they are stored for an extended period of time at a 100% charge. I usually parked mine with a 40 to 50% charge on them.

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PostPosted: Wed Mar 23, 2011 4:15 pm 
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Majestic wrote:
Apparently Lith-Ion batteries will chemically degrade if they are stored for an extended period of time at a 100% charge.


But after being removed from the laptop, the battery won't remain at 100% for a long time anyway.

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PostPosted: Thu Mar 24, 2011 4:07 pm 
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sarbin wrote:
most places i've read suggest 40% charge for long-term storage.


Majestic wrote:
Ditto, I've read the same. Apparently Lith-Ion batteries will chemically degrade if they are stored for an extended period of time at a 100% charge. I usually parked mine with a 40 to 50% charge on them.


Thanks for everyone's replies. I will give them a charge up to 40-50% and hide them in my refridgerator.

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PostPosted: Thu Mar 24, 2011 6:40 pm 
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you're welcome.
i'd also suggest bagging them in a zip-lock for storage and when ready to use, let them come fully to room temp before unbagging so no condensation forms in/on them.

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PostPosted: Thu Mar 24, 2011 6:43 pm 
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Majestic wrote:
Apparently Lith-Ion batteries will chemically degrade if they are stored for an extended period of time at a 100% charge.

The correct statement is Lith-Ion batteries will chemically degrade if they are stored for an extended period of time :!:

The level of charge doesn't make that much difference in practice as far as I've ever been able to tell, but some sources indicate that ~40% is probably the best practice charge level for storage.

Cheers,

Bill B.


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PostPosted: Sat Mar 26, 2011 2:31 pm 
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I got in some new sealed A30 batteries (one is charging now) and there was this note in the box:

"Attention

The Li-Ion battery should be recharged at least one time a year to prevent prolonged exposure to zero charge which may cause a memory or no charge condition. It is recommended to charge battery at least 80% of full charge when planning to store battery for extended time."

A few months back I purchased some new old stock Thinkpad 600 series batteries (in the box) and one charged up just fine while the other seems completely dead. So maybe a few too many years of 0 charge is not a good thing? PS is there a utility for 600 series thinkpads that shows battery information like the newer T20 and above machines?

The A30 batteries are Sanyo 2002 manufacture with 0 cycles.

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PostPosted: Sat Mar 26, 2011 6:12 pm 
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With the 600 series, are they lithium ion or nickel metal hydride? If nickel hydride, I find they tend to die over time faster than LiIon. Could explain why one seems dead.

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PostPosted: Sun Mar 27, 2011 1:11 am 
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They are Litium, the last time I seen one that wasn't lithium was in a Thinkpad 750 series.

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