[NSRCA-discussion] NiMH Question

[John Ferrell]

It is not always good just because it is new!

John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "Anthony Romano" <anthonyr105 at hotmail.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Friday, February 24, 2006 3:10 PM
Subject: Re: [NSRCA-discussion] NiMH Question


>
> If you can check on a buddies cycler. The original Hobbico Accucycle was
> woefully inaccurate. Or just replace them all. Packs are cheaper than
> airplanes.
>
> Anthony
>
>>From: "Michael Cohen" <precisionaero at comcast.net>
>>Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>>To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>Subject: Re: [NSRCA-discussion] NiMH Question
>>Date: Thu, 23 Feb 2006 21:38:32 -0700
>>
>>I have 4 cells on each pack.  I am using the Hobbico Accu-Cycle Elite
>>charger.  I know when I got the packs at first, I did a 0.1C
>>charge/discharge cycle several times to get the packs up to their full
>>potential.  I forgot who recommended that, but it seemed to work great.
>>After that, I never did cycle them again until this season.   As far as 
>>the
>>other data, after this next round of cycling, I'll let you know.
>>
>>
>>
>>----- Original Message ----- 1
>>   From: Grow Pattern
>>   To: NSRCA Mailing List
>>   Sent: Thursday, February 23, 2006 8:58 PM
>>   Subject: Re: [NSRCA-discussion] NiMH Question
>>
>>
>>   I don't think that there is any value or advantage in cycling down an
>>NiMH pack because they do not display any memory behavior. (Like a Nicad)
>>
>>   On the other hand I guess you/we will always need to know how much a
>>battery has left in it.
>>
>>   I was told that you should not take an NiMH battery down too low. I 
>> have
>>killed a few of them by leaving them on too long and once flew too many
>>times and was lucky to get the plane down with one servo action at a time.
>>The pack would not charge back up!
>>
>>   I am curious as to what charger/cycler you are using. How many cells 
>> and
>>what voltage you show after charging and then with a 500 ma load?
>>
>>   Regards,
>>
>>   Eric.
>>
>>
>>   ----- Original Message -----
>>     From: Michael Cohen
>>     To: NSRCA Mailing List
>>     Sent: Thursday, February 23, 2006 9:48 PM
>>     Subject: [NSRCA-discussion] NiMH Question
>>
>>
>>     I am cycling my batteries and getting ready for the flying season. 
>> On
>>my initial 5 cycle run at my NiMH batteries, both my 1650 mAh packs cycled
>>very low.  One pack that I have not used since end of November only cycled
>>up to 850 mAh and the other pack I have not used since end of September
>>only cycled up to 1000 mAh.  My charger is set to 5 cycles, charge and
>>discharge are set to .65 amps with a cutoff voltage at 1.1 Volts per cell.
>>I am now trying 1.00 amp charge/discharge with a 1.0 volt per cell cutoff
>>and it is looking better, but I have some questions:
>>
>>     1)  Did I damage the batteries by letting them self-discharge too 
>> low?
>>  I know NiMH batteries have a higher self discharge rate than NiCD
>>batteries, but I am not aware letting the NiMH batteries run down could
>>cause damage.
>>
>>     2)  Is this a normal behavior?  Maybe NiMH just need a little more
>>juice at the beginning of the season.
>>
>>     3)  Is the cold garage a factor?
>>
>>     Thoughts?
>>
>>     Mike Cohen
>>
>>
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