I'm having real trouble with Sanyo made cells, they all keep dying the dreaded high self-discharge death. So far I have lost a set of Sanyo 2500(30 cycles old), a pair of Engerizer 2500(15 cycles), and now I have just lost a set of Duracell 2650(5 cycles). Meanwhile my 5 year old Sanyo 2300 are going strong. The cells are being used in a digital camera and a Lambda minipro mag(1amp). They are being charged at 900ma on a supernova. Does anyone have any ideas as to why they are so unreliable? Is it just bad technology? Not sure what I should replace them with. Thanks for any advice.
What's going on with my NiMH cells!?
- Thread starter Foxx510
- Start date
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VidPro
Flashlight Enthusiast
umm send em back 
if it dont do what its supposed to do, see if the company will support them.
whats a supernova, and are you following logic for the battery when charging?
are you series charging them then discharging them to different levels?
do you know which battereis went into which device? did you keep them as a "team" or slop them together at different charge and discharge rates?
there is much news about the durability of the highest capacity of cells, actually there always was i bet if we looked back each high capacity had the caveat of durability, especially when they just started doing that. there are some people using ni-cd still because of its great durability.
anyways you could read about all the high-cap issues all around here, a 2000-2200 good battery might be a better choice for anyone having that problem.
if it dont do what its supposed to do, see if the company will support them.whats a supernova, and are you following logic for the battery when charging?
are you series charging them then discharging them to different levels?
do you know which battereis went into which device? did you keep them as a "team" or slop them together at different charge and discharge rates?
there is much news about the durability of the highest capacity of cells, actually there always was
i bet if we looked back each high capacity had the caveat of durability, especially when they just started doing that. there are some people using ni-cd still because of its great durability.anyways you could read about all the high-cap issues all around here, a 2000-2200 good battery might be a better choice for anyone having that problem.
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cd-card-biz
Enlightened
Same problem here with (16) nearly new cells.
I went to the Sanyo website support form here:
http://www.sanyo.com/batteries/feedback.cfm
And asked about warranty. Received a prompt reply to send them back for replacement and was given the address. Sent them back weeks ago, and have heard nothing. Sent two emails since then requesting status. No reply.
So, in a way Sanyo solved my problem with the cells....... I don't have any.
Wishing you luck,
Bill
I went to the Sanyo website support form here:
http://www.sanyo.com/batteries/feedback.cfm
And asked about warranty. Received a prompt reply to send them back for replacement and was given the address. Sent them back weeks ago, and have heard nothing. Sent two emails since then requesting status. No reply.
So, in a way Sanyo solved my problem with the cells....... I don't have any.
Wishing you luck,
Bill
Thanks for the replies guys. Cells have always been kept as sets and series charged, with occasional single cell charges to equalize if needed. A supernova is a microprocessor controlled charger made by SJ propo. Sanyo Australia promptly replaced one set, as did Energizer Australia. Will try my luck with Duracell next week, although I really don't want another set of crap batteries! I'm tempted to try some Eneloops but I have lost a little faith in Sanyo.
VidPro
Flashlight Enthusiast
i have a charger that i trust with my batteries, it seems to be treating these 2500s just fine, its got 10 individual, it must have a low determination for the voltage drop because it charges at only 250ma. it seems to treat them well and doing 10 at a time and taking forever, i dont care, i have enough to change them around.
some of the other chargers dont seem to be so nice, but are certannly faster.
i just mention that, because it didnt cost much, and i would never series charge cells that are already seperated. dont matter what you do at some point in a series charge the charger doesnt know what BOTH battereis are doing, by default it can't be ultamatly kind to them. and aparentally the high-cap need kindness
my radio shack 1 hour (smart) charger on the other hand does them in series, and it can torture them at the end of charge.
some of the other chargers dont seem to be so nice, but are certannly faster.
i just mention that, because it didnt cost much, and i would never series charge cells that are already seperated. dont matter what you do at some point in a series charge the charger doesnt know what BOTH battereis are doing, by default it can't be ultamatly kind to them. and aparentally the high-cap need kindness
my radio shack 1 hour (smart) charger on the other hand does them in series, and it can torture them at the end of charge.
The charger has a pretty sensitive voltage detection as far as I know, and I often check the temp of individual cells near the end of the charge to see if there are any problems. What I don't understand is what happened after the 2300's that made these cells so unreliable compared to the earlier ones. Any other brands/cells worth trying?
Thanks.
Thanks.
VidPro
Flashlight Enthusiast
what is the charge rate you use ?
some of those chargers are soooo controlable you can set the voltage drop sensitivity.
there is a whole ni-mhy shootout thread, the "titaniums" looked sweet.
but everything NEW looks great, heck when NEW all i need is one discharge, and a test cycle and that is everything i need to know about it.
its after 30+ cycles ,that is when we need a test. how about an OLD battery shootout lots more trouble/time to be able to accomplish that.
a self discharge test after 30+ cycles, that is what seems to be the issuees of the day. BUT if that test was JUST cycling on a charger, then sitting on a shelf, that isnt the way a battery is used and abused.
like for example the flash recharge & the write out & the lcd screen on a digital camera, that MOMENT the battery is pummeled.
or a seriesed set of batteries in a Light that sucks the battereis totally dry, reverse charging.
i think the problem is the battery, that many users cant be wrong. but there are things that make it worse.
some of those chargers are soooo controlable you can set the voltage drop sensitivity.
there is a whole ni-mhy shootout thread, the "titaniums" looked sweet.
but everything NEW looks great, heck when NEW all i need is one discharge, and a test cycle and that is everything i need to know about it.
its after 30+ cycles ,that is when we need a test. how about an OLD battery shootout
lots more trouble/time to be able to accomplish that.a self discharge test after 30+ cycles, that is what seems to be the issuees of the day. BUT if that test was JUST cycling on a charger, then sitting on a shelf, that isnt the way a battery is used and abused.
like for example the flash recharge & the write out & the lcd screen on a digital camera, that MOMENT the battery is pummeled.
or a seriesed set of batteries in a Light that sucks the battereis totally dry, reverse charging.
i think the problem is the battery, that many users cant be wrong. but there are things that make it worse.
VidPro
Flashlight Enthusiast
with a "smart" charger doing termination based on Vdrop thing, you need a good rate. like at least 500ma and 900ma should be well within the specs stuff as long as termination occurs.
with a temp probe, you should be able to easily determine if its getting hurt that way.
with a temp probe, you should be able to easily determine if its getting hurt that way.
SilverFox
Flashaholic
Hello Foxx,
There is a known problem with several batches of the 2500 mAh cells. I have had some with problems and others that continue to work fine. This is regardless of the charger they are charged on.
It looks like you just got the "luck" of the draw...
Tom
There is a known problem with several batches of the 2500 mAh cells. I have had some with problems and others that continue to work fine. This is regardless of the charger they are charged on.
It looks like you just got the "luck" of the draw...
Tom
Not much to do. In my experience, all of the 2500 mAh cells made by Sanyo and sold under several other brand-names (Sony, Kodak, Energizer, Varta, and possibly others) are faulty by design. I doubt that Sanyo has solved the problem, i.e. the cells still sold today are the same as the ones sold a year ago. Try to ask for a replacement with some other cells, like 2100 or 2300 mAh, or even better Eneloops.
SilverFox
Flashaholic
Hello Foxx,
Handlobraesing has had problems with the 2650 cells too. I am not sure if they are the same as the 2500 cells, or different.
I can say that the 2700 cells seem to be holding up, so far at least...
Tom
Handlobraesing has had problems with the 2650 cells too. I am not sure if they are the same as the 2500 cells, or different.
I can say that the 2700 cells seem to be holding up, so far at least...
Tom
