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Posted by Rich256 on December 24, 2006, 10:30 am
system21networks@gmail.com wrote:
> Pete C. a écrit :
>
>> Boothbay wrote:
>>> I bought a radio shack multitester to check my batteries, primarily my
>>> laptop batteries. First on my old dead battery of Toshiba laptop, they
>>> had a positive and negative mark shown..so it was easy to check it out
>>> with the tester. But I bought it to check my Dell battery that lasted 1
>>> year to the day of the end of my warranty. Fortunately, i did get a
>>> refurbished one in time. Disappointed that it only lasted a year and I
>>> had only used it a total of maybe 10 hours with the battery on my last
>>> vacation...10 hours in 1 year and poof it went. The battery does not
>>> have a pos and neg shown like the toshiba one..so I cannot test it that
>>> way. In the meantime, I was trying to check some AA and AAA batteries
>>> that I had and was able to understand on how to test them..but I do not
>>> know how to interpret the readings I used the ACV side with it set at
>>> 15. I really don't know what does numbers mean. The manual is a joke,
>>> at least for those of us that have no experience. The line moved a
>>> little to the right where it seem to end a couple of notches on that ac
>>> 15v scale. It read the same for the new battery as well, so what is it
>>> telling me that its a 1.5v battery? How does one know if the battery is
>>> weak or whatever? Does anyone know of a web site that can tell me what
>>> those readings represent? I did a search in google but nothing came to
>>> what I was hoping for.
>> All batteries are DC so you need a DCV range. With a digital meter it
>> doesn't matter which is positive and negative as it will simply show the
>> correct voltage with a - sign if you have it backwards. With an analog
>> meter the needle will go backwards to the stop and you just have to
>> reverse the leads. The meter will be of limited use for rechargeable
>> batteries like a laptop one since it only tells you the voltage, not the
>> state of charge.
>
>
>
> batteries may be DC but some chargers give out AC, it allow the use to
> connect the batterie pack to the charger wihout any care for polarity
> the battery pack contain diode that correct the AC to DC, that could
> explain why there arent any polarity sign.. but beware laptop aren't my
> speciality....
>
???
Can you give an example of such a charger?
I expect the reason for no polarity sign is that the battery can be
inserted into the unit in only one way.
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