elektroda.net NewsGroups Forum Index - Electronic for beginners - The proper way to carge a rechargeable battery?
krw@att.bizzzzzzzzzzzz
Guest
Guest
Sat Sep 04, 2010 2:34 am
On Sat, 04 Sep 2010 10:32:39 +1000, Grant <omg_at_grrr.id.au> wrote:
Quote:
On Thu, 02 Sep 2010 22:43:01 -0500, "krw_at_att.bizzzzzzzzzzzz" <krw_at_att.bizzzzzzzzzzzz> wrote:
On Fri, 03 Sep 2010 11:42:21 +1000, Grant <omg_at_grrr.id.au> wrote:
On Wed, 1 Sep 2010 07:43:59 -0700 (PDT), George Herold <ggherold_at_gmail.com> wrote:
...
Say does anyone know where I can find out how many amp-hours are in my
lead acid car battery. They list cold cranking amps, but I find
nothing about how many amp hours.
They list a reserve or standby time instead, since AH rating deemed too
hard for mere mortals to understand ;)
Actual AH depends on rate of discharge, I think standby time gives a
figure at some agreed discharge rate, but I can't remember the figure.
It's "agreed" to by the manufacturer. There is no standard and indeed there
couldn't be since the rate of discharge is application dependant.
Oh, I though maybe there was some agreement for car starting batteries?
On Fri, 03 Sep 2010 11:42:21 +1000, Grant <omg_at_grrr.id.au> wrote:
On Wed, 1 Sep 2010 07:43:59 -0700 (PDT), George Herold <ggherold_at_gmail.com> wrote:
...
Say does anyone know where I can find out how many amp-hours are in my
lead acid car battery. They list cold cranking amps, but I find
nothing about how many amp hours.
They list a reserve or standby time instead, since AH rating deemed too
hard for mere mortals to understand ;)
Actual AH depends on rate of discharge, I think standby time gives a
figure at some agreed discharge rate, but I can't remember the figure.
It's "agreed" to by the manufacturer. There is no standard and indeed there
couldn't be since the rate of discharge is application dependant.
Oh, I though maybe there was some agreement for car starting batteries?
AH isn't the primary concern for starting batteries. AFAIK, there are
standards for CCA measurements.
Quote:
Long time since I looked as my interest is more in the standby and traction
area.
The standby rate can be found, from there you can work out AH at that
rate, then interpolate to what load you want to run.
No, there is no way of "working" that out. Manufacturers will give different
capacities for various discharge rates, however.
That's because they do vary depending on discharge rate, by quite a bit.
area.
The standby rate can be found, from there you can work out AH at that
rate, then interpolate to what load you want to run.
No, there is no way of "working" that out. Manufacturers will give different
capacities for various discharge rates, however.
That's because they do vary depending on discharge rate, by quite a bit.
....and more importantly the construction of the cells. Like all engineering,
there are tradeoffs to be made and not all make the same choices. The two
parameters cannot be related.
Quote:
Or, you could
measure it yourself, standard method is constant current load X for
Y hours down to say 10.5V for 6cell LA. Recharge the battery and
try again with different X. Rinse & repeat.
Pretty much. ...add a safety margin and you're done. ;-)
For example I have here a 12V 52AH battery weighs heaps and replacement
cost is AU$600, I think it's still at 95% rating (was given to me) --
obviously this thing has far more lead in it than the same physical
size car starter battery.
If you are after deep cycle standby battery, be prepared for sticker
shock.
Yep. It's a specialty item. You don't get the mass market pricing of a
starting battery.
Too true
measure it yourself, standard method is constant current load X for
Y hours down to say 10.5V for 6cell LA. Recharge the battery and
try again with different X. Rinse & repeat.
Pretty much. ...add a safety margin and you're done. ;-)
For example I have here a 12V 52AH battery weighs heaps and replacement
cost is AU$600, I think it's still at 95% rating (was given to me) --
obviously this thing has far more lead in it than the same physical
size car starter battery.
If you are after deep cycle standby battery, be prepared for sticker
shock.
Yep. It's a specialty item. You don't get the mass market pricing of a
starting battery.
Too true
You also get the "marine" adder.
Eeyore
Guest
Guest
Fri Sep 10, 2010 3:22 am
Rui Maciel wrote:
Quote:
After searching for information on how to recharge batteries I was left with contradicting
suggestions regarding the proper way to do it and even what to expect from a recharged battery.
So, in order to sort this out, can anyone tell me what's the proper/optimal way to charge a
rechargeable battery?
suggestions regarding the proper way to do it and even what to expect from a recharged battery.
So, in order to sort this out, can anyone tell me what's the proper/optimal way to charge a
rechargeable battery?
Depends hugely on the battery chemistry and any special
construction/design limits.
Consult the manufacturer.
Graham
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