I suggest testing each individual cell for volts before soldering.
After I've soldered 6 cells together for one side of the cluster, I
measure again with the voltmeter. Results should be around 7V or so.
I may get my test NiMH cluster done this week. BTW, NiMH batteries can
be damaged if left charging too long with a charger intended for nicads.
Unfortunately, you cannot leave them charging overnight as you could
with the nicad cells. Charger should be put on a timer.
___________________________________
John Hermanson
Camtech Photo Services, Inc.
Jeff Keller wrote:
> Just measuring the voltage will probably tell you if the connections
> are good.
>
> If you try to measure ohms or "continuity" across a voltage source
> such as a battery, the voltage source will force current, quite
> likely too much current, to flow through your meter. I noticed in one
> of your pictures your meter was set to a 1 ohm range. Perhaps you
> only measured the voltage and not the "ohms".
>
> If you want to test how good your connections are you could try to
> find a resistor to use as a load. In this case you have 175mah
> batteries with about 15v. So you would want a resistance of about 15v
> / 0.175a = 86 ohms (or maybe less) but it must handle nearly 3
> watts. The motor drive probably takes a higher short burst current
> than this, but as a very "approximate" test, just discharging the
> battery at a current rating equal to its amp hour number would show a
> voltage drop if the connections weren't good enough. In this case
> just operating the motor drive would be a better test.
>
> If all you did was measure voltage, your meter is as good as anything
> you could use.
>
> -jeff
>
>
> On 12/21/06, Michael Wong <mialop@xxxxxxxxxxxx> wrote:
>
>> Thanks, Jeff. What equipment should I use to measure?
>>
>> -- Michael
>>
>> Palm, Linux, Olympus, Mac user
>>
>>
>> 2006/12/21, Jeff Keller <jeffreyrkeller@xxxxxxxxx>:
>>
>>> That looks like a nice "do it yourself" job. Thanks for posting
>>> all of the pictures.
>>>
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