[NSRCA-discussion] NiMH Question

[Anthony Romano]

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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