Steve'sDigicams

itsme000 · Dec 5, 2006, 9:49 PM

Well, my 2650mAh Duracells are starting to bite the dust after less than 50 cycles and six months or so of use.

itsme000 · Apr 25, 2007, 6:56 AM

Two of these cells started to lose their entire charger overnight and the other two lost about 300mAh in capacity and lose the entire capacity in about two weeks.

These were incredible performers out of the box, but go bad rather fast.

These are Made in Japan and I believe they're relabeled Sanyo 2700s

Tom Brown · Apr 26, 2007, 6:24 PM

Kalypso wrote:

Quote:

I have the "older" version of the LaCrosse BC-900 & it's always worked like a champ.

Ditto that.

I purchased three BC-900 chargers about a year ago. One melted down, early in it's life. LaCrosse replaced it with a "tested" unit but the replacement unit only had three working slots and LaCrosse would not replace the replacement.

I've since given away the 3 slot BC-900 to someone who is delighted to have that level of functionality, even if only in three slots.

If you keep air blowing over the charges when they are charging, I believe they will not melt down regardless of the firmware or hardware revision they run.

Kemi · Feb 26, 2008, 6:48 PM

itsme000, I see you know this battery well so I think you must be the person to ask about it.

My son and I have two digital cameras. His takes only 2 AA batteries and mine takes 4 AA. We have some duracell 1800 mAh batteries and some 2650 mAh batteries. When we use the 1800 in my son's camera it starts up and shuts down right away. The 2650's work fine for him.

In my camera I can use either equally well, but I'm sure the 2650's last longer.

My question is why do the 1800's not work at all in my son's camera? Is it because he uses only 2 cells and it's not enough power to run the camera?

thanks for your help,
Kemi

SilverFoxCPF · Feb 27, 2008, 9:04 PM

Hello Kemi,

What is happening is your sons camera is getting a low voltage warning and shutting off. The load from the camera is proportionally higher on the 1800 mAh cells, than it is on the 2650 mAh cells.

Your 1800 mAh cells may have developed high internal resistance. This means that when under load, their voltage drops more than newer cells with lower internal resistance. You may find your 1800 mAh cells are at the end of their useful life.

Tom

Kemi · Mar 1, 2008, 7:44 AM

Thank you for the reply SilverFoxCPF

Quote:

You may find your 1800 mAh cells are at the end of their useful life.

The 1800 mAh cells were new out of the box when first charged and used in my sons camera. They never worked for him since the first... although I could use them in my camera just fine.

SilverFoxCPF · Mar 1, 2008, 5:47 PM

Hello Kemi,

Depending on how old they were, and how they were stored, they very well could have had "issues" right out of the box.

When you get "new" cells, the first thing you should do is measure their voltage. If they are under 1.0 volts, you may have some difficulty getting them to work properly. If they are below 0.9 volts, they usually will never work properly. A fresh cell, stored properly, will be at around 1.2 volts, for comparison.

If you have access to an battery analyzer, you can try a few charge/discharge cycles to see if they will recover.

Tom

itsme000 · Aug 29, 2009, 7:10 PM

I've since disposed of about a dozen Duracell 2650mAh cells due to irrecoverable internal resistance. These are good at first, then they begin to suck quickly. Well, what good is a high capacity RECHARGEABLE that do not remain high capacity for long?

The Duracell pre-charged and Sanyo eneloop are only ~2000mAh, however they hold their capacity better.

When batteries read 1.3v + with no load, but immediately shows "low battery" in camera, then they've developed high internal resistance and it's time for them to go.

My experience shows that 500-1000 cycles is only in dreams. They're only measuring mAh capacity and not the ability to provide current. The dozen or so 2650mAhs I've discarded all had less than 50 cycles. The test is based on a constant current discharge in a laboratory setting. Letting it sit around, letting it drain to 0.0V, etc, as seen in real life significantly degrades life.

Don't expect anything near 500-1000 cycles of full performance, but if you can get 50 cycles out of a set, then you're getting a reasonably good return on investment compared to alkaline.

slybunda · Nov 9, 2009, 10:30 AM

my 2650mah duracell rechargables are dying badly now, i got 8 AA cells and biggest problem they have is charge retention only last a couple of days. and these batteries are new only 1 month old.

my 2500 energizers last a few months with only suffering a tiny amount of self discharge. waste of money these duracells are. can only use them in the radio controlled car as soon as i charge the batteries up. leave them for a few days and they loose a fair percentage of thier charge. may look at getitng some sanyo eneloops after i read up some reviews on them.

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Dec 5, 2006, 9:49 PM	#21
itsme000 Senior Member Join Date: May 2006 Posts: 169	Well, my 2650mAh Duracells are starting to bite the dust after less than 50 cycles and six months or so of use.

Apr 25, 2007, 6:56 AM	#22
itsme000 Senior Member Join Date: May 2006 Posts: 169	Two of these cells started to lose their entire charger overnight and the other two lost about 300mAh in capacity and lose the entire capacity in about two weeks. These were incredible performers out of the box, but go bad rather fast. These are Made in Japan and I believe they're relabeled Sanyo 2700s

Feb 26, 2008, 6:48 PM	#24
Kemi Junior Member Join Date: Feb 2008 Posts: 2	itsme000, I see you know this battery well so I think you must be the person to ask about it. My son and I have two digital cameras. His takes only 2 AA batteries and mine takes 4 AA. We have some duracell 1800 mAh batteries and some 2650 mAh batteries. When we use the 1800 in my son's camera it starts up and shuts down right away. The 2650's work fine for him. In my camera I can use either equally well, but I'm sure the 2650's last longer. My question is why do the 1800's not work at all in my son's camera? Is it because he uses only 2 cells and it's not enough power to run the camera? thanks for your help, Kemi

Feb 27, 2008, 9:04 PM	#25
SilverFoxCPF Senior Member Join Date: Jul 2005 Posts: 358	Hello Kemi, What is happening is your sons camera is getting a low voltage warning and shutting off. The load from the camera is proportionally higher on the 1800 mAh cells, than it is on the 2650 mAh cells. Your 1800 mAh cells may have developed high internal resistance. This means that when under load, their voltage drops more than newer cells with lower internal resistance. You may find your 1800 mAh cells are at the end of their useful life. Tom

Mar 1, 2008, 5:47 PM	#27
SilverFoxCPF Senior Member Join Date: Jul 2005 Posts: 358	Hello Kemi, Depending on how old they were, and how they were stored, they very well could have had "issues" right out of the box. When you get "new" cells, the first thing you should do is measure their voltage. If they are under 1.0 volts, you may have some difficulty getting them to work properly. If they are below 0.9 volts, they usually will never work properly. A fresh cell, stored properly, will be at around 1.2 volts, for comparison. If you have access to an battery analyzer, you can try a few charge/discharge cycles to see if they will recover. Tom

Aug 29, 2009, 7:10 PM	#28
itsme000 Senior Member Join Date: May 2006 Posts: 169	I've since disposed of about a dozen Duracell 2650mAh cells due to irrecoverable internal resistance. These are good at first, then they begin to suck quickly. Well, what good is a high capacity RECHARGEABLE that do not remain high capacity for long? The Duracell pre-charged and Sanyo eneloop are only ~2000mAh, however they hold their capacity better. When batteries read 1.3v + with no load, but immediately shows "low battery" in camera, then they've developed high internal resistance and it's time for them to go. My experience shows that 500-1000 cycles is only in dreams. They're only measuring mAh capacity and not the ability to provide current. The dozen or so 2650mAhs I've discarded all had less than 50 cycles. The test is based on a constant current discharge in a laboratory setting. Letting it sit around, letting it drain to 0.0V, etc, as seen in real life significantly degrades life. Don't expect anything near 500-1000 cycles of full performance, but if you can get 50 cycles out of a set, then you're getting a reasonably good return on investment compared to alkaline.

Nov 9, 2009, 10:30 AM	#29
slybunda Junior Member Join Date: Jul 2009 Posts: 1	my 2650mah duracell rechargables are dying badly now, i got 8 AA cells and biggest problem they have is charge retention only last a couple of days. and these batteries are new only 1 month old. my 2500 energizers last a few months with only suffering a tiny amount of self discharge. waste of money these duracells are. can only use them in the radio controlled car as soon as i charge the batteries up. leave them for a few days and they loose a fair percentage of thier charge. may look at getitng some sanyo eneloops after i read up some reviews on them.