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Old Jan 27, 2005, 12:04 AM   #1
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Can someone recommend me a not costly battery tester
that can test the capacity (in amp-hour) of AA battery?
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Old Jan 27, 2005, 1:25 AM   #2
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http://www.thomas-distributing.com/battery_testers.htm
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Old Jan 27, 2005, 2:29 AM   #3
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steve wrote:
Actually, I'm looking for a meter that can tell me how
much capacity left in my nimh batteries. The testers
above won't do the trick.
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Old Jan 27, 2005, 4:23 AM   #4
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Yes, Jedi, You are correct. Those battery testers will tell if the battery needs charging, or not.

But I dont think there is any tester that will show how much capacity is left in cells.

If you think of capacity as in mah, how would any tester determine that, apart from discharging the cells over time.

Nice thought, maybe some time, some one will produce one.
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Old Jan 27, 2005, 5:22 AM   #5
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Baz wrote:
Quote:
Yes, Jedi, You are correct. Those battery testers will tell if the battery needs charging, or not.

But I dont think there is any tester that will show how much capacity is left in cells.

If you think of capacity as in mah, how would any tester determine that, apart from discharging the cells over time.

Nice thought, maybe some time, some one will produce one.
I have seen a high end battery capacity analyzer for testing
12V SLA battery which is widely used for backup. If you own
a laptop then Windows's battery utility shows you the
capacity left in your laptop's battery (not in Amp-hour
but in percentage). So technology exists today.

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Old Jan 27, 2005, 9:41 AM   #6
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jedi_master wrote:
Quote:
Can someone recommend me a not costly battery tester
that can test the capacity (in amp-hour) of AA battery?
There is no easy way to measure the capacity, except by discharging it. The answer you'd get if you did would depend on the load, i.e., how fast you did it, which might well not correspond to your normal use of the cell. It would also depend on temperature.

The best you'll do easily is to use a cheap digital multimeter (costing about 10ukpounds and probably about 10 USdollars) which has a 'battery test' range. This measures the current delivered bythe cell whenit has astandard load (a resistor)applied to it. You can tell the condition of a cell very roughly by comparing this discharge current to that of a known fully-charged, properly-working cell.

The aboveapplies to Ni-MH cells and many other systems. There are fairly good ways of measuring the remaining capacity of lead-acid wet cells, as used in vehicle starting-lighting-ignition batteries and many other applications (some gigantic). It's a lot more uncertain with other battery systems.

Sony's 'infolithium' Li-ion batteries do some clever things, and claim to indicate remaining capacity. I'm not sure how accurate it is, because the software clearly can't foretell the future, in terms of how often & how hard and when the battery is used.

If you want to learn more about battery systems I recommend http://www.batteryuniversity.com/index.htm.

I was an electrochemist for my 25-year research career. Lead-acid batteries have been going for over 150 years, and we still haven't got it quite right yet, so don't expect too much! I think AA Ni-MH cells are pretty wonderful.

Good luck! Alan T
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Old Jan 27, 2005, 7:11 PM   #7
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Have seen good comments about this item

http://www.lacrossetechnology.com/pr...ems/bc900.html

in this forum

http://www.candlepowerforums.com/ubb...t=all&vc=1
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Old Jan 28, 2005, 2:17 AM   #8
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virgil_dlv wrote:
Thank you very much for the pointer. This is the toy that
I've been looking for. I'll buy it tomorrow without any
hestation. And I'll put my MAHA 401 in the closet once I
get this cool toy. I think charger like MAHA will become
a thing in the past. Thanks again.

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Old Jan 28, 2005, 2:48 AM   #9
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I tried reading the comments in the forum about the LaCrosse charger. :? It's too technical for me to understand. And I can't find the information I needed from the link to the charger itself. My question is, was it able to tell how much charge is left in battery?
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Old Jan 28, 2005, 3:28 AM   #10
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...ben wrote:
Quote:
I tried reading the comments in the forum about the LaCrosse charger. :? It's too technical for me to understand. And I can't find the information I needed from the link to the charger itself. My question is, was it able to tell how much charge is left in battery?
I don't believe you can by simply inserting the battery. However, it can display how much display being discharged
or charged in Amh hour. So no guessing game on how good
the battery or how fully it got charged. The refresh and
test functionalities alone worth something which my MAHA
401 lacks. I just ordered one online a few minutes ago.
I can't wait to play with this cool toy.
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