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#1
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How much power is in a 100ah battery
I Beg to differ with you.
I have on occasions, and know friends who have damaged Ni-Cad batteries. They were damaged by partial depletion then recharging. They were in sealed waterproof torches and over a period of time the batteries were damaged by that method of charging. I now always run my batteries from full to empty no mater what type. taz. Top-up charging is the best regime for NiCd's used in a torch. Full discharge every time simply wears out the cells unnecessarily. Of course cells vary enormously in quality and it is virtually impossible to buy decent ones from retail outlets. -- Keith Lewis I agree Keith there are a lot of variables to batteries and the way they are charged. The trouble with most set-ups IMHO is one cell will fail in the battery and then the battery as a unit starts to perform badly. Good cells are hard to get hold of and can easily be damaged by incorrect use. In my experience if a cell is sold with the label good for 2000 charge cycles I've found that, that number can be reduced by half if not even 3/4. So in real terms a battery that should be good for 2000 charges sometimes only last for 500 maybe 1000 charges. Not a scientific answer just my own experience. taz. |
#2
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How much power is in a 100ah battery
In message , taz
writes I Beg to differ with you. I have on occasions, and know friends who have damaged Ni-Cad batteries. They were damaged by partial depletion then recharging. They were in sealed waterproof torches and over a period of time the batteries were damaged by that method of charging. I now always run my batteries from full to empty no mater what type. taz. Top-up charging is the best regime for NiCd's used in a torch. Full discharge every time simply wears out the cells unnecessarily. Of course cells vary enormously in quality and it is virtually impossible to buy decent ones from retail outlets. -- Keith Lewis I agree Keith there are a lot of variables to batteries and the way they are charged. The trouble with most set-ups IMHO is one cell will fail in the battery and then the battery as a unit starts to perform badly. Good cells are hard to get hold of and can easily be damaged by incorrect use. In my experience if a cell is sold with the label good for 2000 charge cycles I've found that, that number can be reduced by half if not even 3/4. So in real terms a battery that should be good for 2000 charges sometimes only last for 500 maybe 1000 charges. Not a scientific answer just my own experience. taz. Agreed Cells are extremely variable and the ones on retail sale tend to give good ones a bad name. Many are in "D" size cases but are only around 1200 mAH as opposed to an average of 4000 mAH for those available to OEM's We've been manufacturing NiCd powered lighting for over 20 years and have been giving a 3 year guarantee for that time. We do however fit rather good ones:-) -- Keith Lewis |
#3
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How much power is in a 100ah battery
Agreed
Cells are extremely variable and the ones on retail sale tend to give good ones a bad name. Many are in "D" size cases but are only around 1200 mAH as opposed to an average of 4000 mAH for those available to OEM's We've been manufacturing NiCd powered lighting for over 20 years and have been giving a 3 year guarantee for that time. We do however fit rather good ones:-) -- Keith Lewis If I need NiCad cells now I use the ones that power emergency lights. They come pre-made into batteries and do seem to be of higher quality. taz. |
#4
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How much power is in a 100ah battery
In message , taz
writes Agreed Cells are extremely variable and the ones on retail sale tend to give good ones a bad name. Many are in "D" size cases but are only around 1200 mAH as opposed to an average of 4000 mAH for those available to OEM's We've been manufacturing NiCd powered lighting for over 20 years and have been giving a 3 year guarantee for that time. We do however fit rather good ones:-) -- Keith Lewis If I need NiCad cells now I use the ones that power emergency lights. They come pre-made into batteries and do seem to be of higher quality. taz. They tend to be "high temperature" versions (gets warm in emergency lighting luminaires) so separator design has to be good. Dendritic crystal growth through separators is the usual failure mode of Nicd's -- Keith Lewis |
#5
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How much power is in a 100ah battery
They tend to be "high temperature" versions (gets warm in emergency
lighting luminaires) so separator design has to be good. Dendritic crystal growth through separators is the usual failure mode of Nicd's -- Keith Lewis Is that a white powdery substance. Or I'm I just thinking of corrosion that forms on the aluminium casing sometimes. taz. |
#6
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How much power is in a 100ah battery
In message , taz
writes They tend to be "high temperature" versions (gets warm in emergency lighting luminaires) so separator design has to be good. Dendritic crystal growth through separators is the usual failure mode of Nicd's -- Keith Lewis Is that a white powdery substance. Or I'm I just thinking of corrosion that forms on the aluminium casing sometimes. taz. No its internal and causes tiny short circuits through the separator. Eventually these raise the self-discharge rate to unmanageable proportions ( but you will probably find that straight off charge you still get sufficient capacity). The cases are nickel plated steel -- Keith Lewis |
#7
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How much power is in a 100ah battery
No its internal and causes tiny short circuits through the separator.
Eventually these raise the self-discharge rate to unmanageable proportions ( but you will probably find that straight off charge you still get sufficient capacity). The cases are nickel plated steel -- Keith Lewis Right I must be getting confused then :-) Not hard I suppose. I understand what you are saying about the internal circuits now and as for the casing I obviously can't tell my nickel from my ally. Thinking back though and this is me trying to scratch back some resemblance of intelligence, our batteries were placed in aluminium bodied torches and with the added ingredient of see water it could of been that environment that was causing the corrosion inside the inside the torch and on the battery. Well that theory makes sense to me. Yeah good one taz. taz slinks of congratulating him self on how he pulled it back without any one noticing. ;-) Cheers taz. |
#8
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How much power is in a 100ah battery
In article , taz24taz24
@blueyonder.co.uk says... They tend to be "high temperature" versions (gets warm in emergency lighting luminaires) so separator design has to be good. Dendritic crystal growth through separators is the usual failure mode of Nicd's -- Keith Lewis Is that a white powdery substance. Or I'm I just thinking of corrosion that forms on the aluminium casing sometimes. taz. FWIW, The white powder associated with (leaking/venting) NiCds is usually potassium hydroxide, a rather caustic material. A chemical "cousin" is soduim hydroxide (lye). Don't ingest or get in eyes, needless to say... Woody |
#9
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How much power is in a 100ah battery
Is that a white powdery substance. Or I'm I just thinking of corrosion that forms on the aluminium casing sometimes. taz. FWIW, The white powder associated with (leaking/venting) NiCds is usually potassium hydroxide, a rather caustic material. A chemical "cousin" is soduim hydroxide (lye). Don't ingest or get in eyes, needless to say... Woody It did tend to sting the skin if it came into contact with it. taz. |
#10
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How much power is in a 100ah battery
Woody wrote: FWIW, The white powder associated with (leaking/venting) NiCds is usually potassium hydroxide That's actually a bit of a relief. I assumed it had a lot of cadmium in it, and I'd rather a hydroxide burn than cadmium poisoning! Andy. |
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