Lithium Ion Self Discharge?

[lightfusegetaway]

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

[jcotton55]

My canon fs100 camcorders battery goes from 100 % to 30 % in two weeks,
I hope this improves.

James

[coppertrail]

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.

[jcotton55]

The fifth charge holds at about 80 % on my canon fs100 camcorders battery
after setting 3 weeks. Much better !

James

[splunker]

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.

[SteveB]

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.

[neilcrichton]

Originally Posted by splunker

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?

[VTphotog]

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