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Re: what's up with nicad batteries?
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Re: what's up with nicad batteries? Ecnerwal 10-12-2007
Posted by Ecnerwal on October 12, 2007, 5:19 pm
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> We use a fair amount of batteries, mostly aa and aaa, to power various
> gadgets.
...
> Any recommendations?

Use NiMh. But it matter both what you are using them for/in, what
charger you use, and how well you maintain things.

If you believe in memory effect, please go flush your brain until you
don't, or until you only believe that it applies to specific situations
run into on satellites with NiCd - and you're being told to get NiMh.

Running rechargables "totally flat" is bad, leaving them flat is worse
(if you must run them "out", then recharge immediately). Recharge early
and often is the current conventional wisdom.

If not using them for a month or more, recharge them every month, or
you'd have been better off with non-rechargeables.

Putting it in a long-term low-draw item like a clock - buy a
non-rechargeable.

Charger - I like a "smart" one - present version I have will charge 1-4
cells to 80% in 15 minutes - has temperature sensing, a fan, charges in
pulse mode, doesn't fry batteries that are left in it for days or weeks.
Could be a bit better in that it does not have a definitive indication
when it's done with the last of trickle charging, but it does what I
want one to do, having had poor experiences with trickle-charging
versions.

Sets. Mark batteries to maintain "sets" to fit your appliances, and
keep/use/charge each set together.

Shop carefully - you can easily pay 3-4X the price for exactly the same
thing by shopping carelessly, or you can be mislead by something
described as a "rapid" charger which defines "rapid" as "8 hours"
somewhere in the fine print. Look for larger packages of batteries,
which might be cheaper per battery - 20 packs, for instance.

Works for me. I've been feeding them to the heavy-draw AA stuff around
here and it's been working fine for several months - no way to tell how
it will be in the longer long term, but it's already cheaper than
disposables would have been (mostly because those cost so much).

--
Cats, coffee, chocolate...vices to live by

Posted by Arnold Walker on October 12, 2007, 11:28 pm
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>
>> We use a fair amount of batteries, mostly aa and aaa, to power various
>> gadgets.
> ...
>> Any recommendations?
>
> Use NiMh. But it matter both what you are using them for/in, what
> charger you use, and how well you maintain things.
>
> If you believe in memory effect, please go flush your brain until you
> don't, or until you only believe that it applies to specific situations
> run into on satellites with NiCd - and you're being told to get NiMh.
>
> Running rechargables "totally flat" is bad, leaving them flat is worse
> (if you must run them "out", then recharge immediately). Recharge early
> and often is the current conventional wisdom.
>
> If not using them for a month or more, recharge them every month, or
> you'd have been better off with non-rechargeables.
>
> Putting it in a long-term low-draw item like a clock - buy a
> non-rechargeable.
>
> Charger - I like a "smart" one - present version I have will charge 1-4
> cells to 80% in 15 minutes - has temperature sensing, a fan, charges in
> pulse mode, doesn't fry batteries that are left in it for days or weeks.
> Could be a bit better in that it does not have a definitive indication
> when it's done with the last of trickle charging, but it does what I
> want one to do, having had poor experiences with trickle-charging
> versions.
>
> Sets. Mark batteries to maintain "sets" to fit your appliances, and
> keep/use/charge each set together.
>
> Shop carefully - you can easily pay 3-4X the price for exactly the same
> thing by shopping carelessly, or you can be mislead by something
> described as a "rapid" charger which defines "rapid" as "8 hours"
> somewhere in the fine print. Look for larger packages of batteries,
> which might be cheaper per battery - 20 packs, for instance.
>
> Works for me. I've been feeding them to the heavy-draw AA stuff around
> here and it's been working fine for several months - no way to tell how
> it will be in the longer long term, but it's already cheaper than
> disposables would have been (mostly because those cost so much).
>
> --
> Cats, coffee, chocolate...vices to live by
Been there done that for about 10 ten now.....on flashlights it don't harm
to get
led's if you using it a lot.On night deliveries led's and rechargeable
batteries last as many
as the old flashlights and non-rechargable did in days roughly.You have
throw that rechargable
out after 100th charge though I had some that last out to 200 charges.A lot
of what used was
RayoVac rechargable.
>



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Posted by Ulysses on October 14, 2007, 3:13 pm
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>
> > We use a fair amount of batteries, mostly aa and aaa, to power various
> > gadgets.
> ...
> > Any recommendations?
>
> Use NiMh. But it matter both what you are using them for/in, what
> charger you use, and how well you maintain things.
>
> If you believe in memory effect, please go flush your brain until you
> don't, or until you only believe that it applies to specific situations
> run into on satellites with NiCd - and you're being told to get NiMh.
>
> Running rechargables "totally flat" is bad, leaving them flat is worse
> (if you must run them "out", then recharge immediately). Recharge early
> and often is the current conventional wisdom.
>
> If not using them for a month or more, recharge them every month, or
> you'd have been better off with non-rechargeables.
>
> Putting it in a long-term low-draw item like a clock - buy a
> non-rechargeable.
>
> Charger - I like a "smart" one - present version I have will charge 1-4
> cells to 80% in 15 minutes - has temperature sensing, a fan, charges in
> pulse mode, doesn't fry batteries that are left in it for days or weeks.
> Could be a bit better in that it does not have a definitive indication
> when it's done with the last of trickle charging, but it does what I
> want one to do, having had poor experiences with trickle-charging
> versions.
>
> Sets. Mark batteries to maintain "sets" to fit your appliances, and
> keep/use/charge each set together.
>
> Shop carefully - you can easily pay 3-4X the price for exactly the same
> thing by shopping carelessly, or you can be mislead by something
> described as a "rapid" charger which defines "rapid" as "8 hours"
> somewhere in the fine print. Look for larger packages of batteries,
> which might be cheaper per battery - 20 packs, for instance.
>
> Works for me. I've been feeding them to the heavy-draw AA stuff around
> here and it's been working fine for several months - no way to tell how
> it will be in the longer long term, but it's already cheaper than
> disposables would have been (mostly because those cost so much).
>
> --
> Cats, coffee, chocolate...vices to live by

I've had success with Sunpak NiMh AA batteries. I replaced the NiCads that
came in my solar malibu lights years ago and they still go all night. The
NiCads only lasted about a year. Several years ago Sunpak AA 1600 ma
batteries were selling all over the internet for very little money. I
bought about 200 of them. Funny thing is they seem to have higher capacity
than the 2000 ma Sunpaks. I also use the Sunpak "Quick Chargers." They
will charge to the point were the "charged" indicator comes in a a couple of
hours but I usually leave them in there overnight because I don't believe
they are at full charge that quickly. But, if you need them right away they
can be used. I have used my Sunpak 1600s daily in flashlights and cameras
and CD players for several years now and they still work quite well. I
would guess they have each been recharged well over 500 times. Probably
closer to 1000 times I also have some AAA NiMh batteries made by some
company I've never heard of that are not all that great. Some have leaked.



Posted by Jim on October 14, 2007, 3:35 pm
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I also have some AAA NiMh batteries made by some
> company I've never heard of that are not all that great. Some have
> leaked.
>
SAKAR? WalMart sells that crap. I don't trust it at all.



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