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Old Jul 28, 2009, 10:09 PM   #1
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Default Lithium Ion Self Discharge?

Hello -

I am curious, for those who have experience with Lithium Ion batteries, what is the self-discharge rate like? I realize it varies from one to another, but is there a general figure on how frequent one would need to charge these up? Could I reasonably expect as an example, a 1500 mah Canon battery pack to hold its' charge over a month?

Thanks!

Owen
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Old Jul 29, 2009, 6:00 PM   #2
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My canon fs100 camcorders battery goes from 100 % to 30 % in two weeks,
I hope this improves.

James
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Old Jul 31, 2009, 10:22 AM   #3
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I charge up my Li-Ion packs about once every 3 mo or so. It's not uncommon for it to still be at 80% or higher after sitting for 3 mo.
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Old Aug 22, 2009, 3:04 AM   #4
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The fifth charge holds at about 80 % on my canon fs100 camcorders battery
after setting 3 weeks. Much better !

James
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Old Aug 23, 2009, 12:11 AM   #5
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It's impossible that li-ion cells would self discharge to 30% in 2 weeks.
Either you battery pack is faulty or you camera has parasitic drain while its battery is in body.

By nature of their chemistry, healthy li-ion cells will still retain over 90% capacity after 1 year of storage.
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Old Nov 15, 2009, 2:23 AM   #6
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Draining over a 3 week period has to be the camera at fault. Leaky capacitors usually, there's a lot of cheap components around these days.
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Old Nov 15, 2009, 5:56 AM   #7
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Quote:
Originally Posted by splunker View Post
It's impossible that li-ion cells would self discharge to 30% in 2 weeks.
Either you battery pack is faulty or you camera has parasitic drain while its battery is in body.

By nature of their chemistry, healthy li-ion cells will still retain over 90% capacity after 1 year of storage.
That may be true of new batteries, but I have 4 li-ion batteries for my 2 Nikon Coolpix 995's. Two are the originals, now several years old, and two are back-ups I bought recently. The new ones keep a full charge for a long time, but the old ones go flat after a month or two, even when they're not installed. Is there some procedure that might rejuvenate them?
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Old Nov 15, 2009, 5:26 PM   #8
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Apparently, lithium ion cells lose capacity after a couple years whether or not they are used. Again, it seems to be the nature of the chemistry involved. As with the NiMH cells, they have a limited life.

brian
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Old Nov 25, 2009, 9:49 AM   #9
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If your camera has a real time clock (keeps the right day/time) then it has to have a battery to run it and that battery will recharge from your main battery and drain it down.
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Old Nov 25, 2009, 10:34 AM   #10
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Many RTCs are powered by primary Lithium cells, which have a minumum 5 year life in that kind of service, and do not drain the camera power. Some, mostly newer cameras RTCs are powered by capacitors, which do get their charge from the camera batttery, but will run for up to 6 months on a charge. So, any power used by the RTC is entirely negligible, and probably less than the cell's self-discharge current.

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