Ian, you are correct about the typo. Most if not all battery mfr's rate their
batteries by discharging at the rated capacity as I was doing.
CheapBatterypacks think the 1450 mah Elite 2/3a's are a better choice right now
so I will try those, since thats all with decent capacity that fit's in my
Supras.
Regards, Dave Corven.
PS. A few years ago I worked on a Jeep hydraulic suspension program over in
Dunsbourgh, south west corner of your great country. also great people and wine.
-------------- Original message ----------------------
From: "Ian Roach" <[EMAIL PROTECTED]>
> Dave,
>
> I have not used the particular brands of cell you refer to but, until
> recently, I was disappointed in the performance of all the NiMH cells I had
> used for Rx and Tx applications, and decided to change back to NiCd packs.
>
> I found that my NiMH packs were lucky to achieve their nominal capacity even
> when new, and that capacity deteriorated rapidly. Frequent cycling was
> necessary to keep them working satisfactorily.
>
> I hope your 1C charge rate for 24 hours is a misprint. This rate is far too
> high, and should be C/10.
>
> To get the best out of NiMH packs I found I had to cycle them, when new, at
> least three times, charging at C/10 until they were warm, and discharging at
> say 300mA. I use an uncontrolled charger for this purpose as I find chargers
> with peak detection frequently terminate the charge prematurely, or
> alternatively not at all, when operating at low currents.
>
> Occasional cycling by the same method is still needed.
>
> I got better performance this way, but was still not happy.
>
> More recently I have tried the Sanyo Eneloop NiMH cells in AA and AAA sizes.
> Their performance is outstanding. Their capacity is as specified by the
> maker. I have only been using them for about six months so it is probably
> too soon to say, but so far there is no sign of loss of capacity. They do
> not lose charge quickly while stored like other NiMH cells. Sanyo claims
> they retain 85% after a year and 90% after 3 months. In a test I found I
> still had 95% capacity after one month.
>
> I give them the full break-in treatment described above, though I think they
> would work quite well without it.
>
> In summary, my experience with NiMH cells was much the same as yours until I
> tried Eneloops. They have the energy density of other NiMH cells without the
> disadvantages, and they hold charge better than NiCd cells. And, at least
> around here, they cost no more than other NiMH cells.
>
> *****************************************************
> Ian Roach Kiama, NSW Australia
>
> [EMAIL PROTECTED] Phone: 61 2 4232 1775
> *****************************************************
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> Sent: Friday, 25 April 2008 11:21 AM
> To: soaring@airage.com
> Subject: [RCSE] NIMH Rx Battery Packs
>
>
> Questions, questions.
>
> I have going through my rx packs with a West Mountain analyzer ( 1 C) and
> charging with a Sirius Former (approx 24hrs @ 1C).
>
> So far I have 4 Intelect ( IB ) cells, 1200 mah (2) and 1400 mah (2), 2/3 A
> size, that have failed muster with 60% to 70% capacity with one 1400mah
> holding at 90%.
>
> My two nicad packs, 700 & 1100 mah, AA sized, have passed @ 95% and 93%
> respectively.
>
> The Intelect cells are no more than 2 to 3 years old with the nicads over 4
> years of age.
>
> I am rapidly coming to the conclusion that the NIMH cells are only good for
> 2 seasons of flying, and the IB's less, on the average, as rx packs.
>
> What are others experience with these cells ?
>
> Regards, Dave Corven.
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