Hello All,
The question came up on DG's website and their answer was a flat 'Hell NO'. To
use any other than the approved battery (which is lead acid) is a major mod and
you are on your own. Ohter than the regulatory side the fire risk was obviously
mentioned.
Rolf
> Date: Sat, 28 Jun 2008 23:06:29 +1000> From: [EMAIL PROTECTED]> To:
> aus-soaring@lists.internode.on.net> Subject: Re: [Aus-soaring] Gell Cell
> Battery alternatives?> > Dear Wayne> I note that the April-May 2008 Sailplane
> and Gliding inside front cover > advertises the "Lynx Aviation Battery" being
> NiMH based. Same package > size 'footprint' as the 'standard' 7 Ah Gel cell
> but offering 10 Ah at 5 > Amps. Plus weight reduction at 1.9 kg, whereas my
> measurements show > standard gell cells as 2.4 to 2.7 kg.> > As for gell
> cells, there is some cheap rubbish out there and I have had > some poor
> outcomes from cheaper batteries in recent times. So it is > back to Panasonic
> for me. So far so good. Going back 5 - 6 years ago > the club and I had a
> very good run out of Century brand gell cells but > that was some time back
> and so how would one know if current Century > gell cells are the same as
> previous? Possibly also the same problem may > occur with a name brand like
> Panasonic if too much value engineering > goes into product "improvement". As
> to gell cell battery condition we > have had useful results from a gell cell
> battery test circuit which > measures time from full charge down to 10.5
> volts at 550 mA. This test > takes time. One of the lads has a mhos (did I
> get it right?) measuring > gadget which gives you a battery condition measure
> at that one point in > time when the measurement is made. But anyway you have
> probably > encompassed some of this kind of kit so I may not be offering
> anything > you don't already know.> > Regards> > Roger Druce> > > Wayne
> Hadkins wrote:> > In recent years, there have been regular ongoing
> improvements in Lithium Ion> > battery technology, driven by the mobile
> communication, mobile computing &> > mobile tool markets. As a result, do any
> of you have experience with battery> > types other than the ubiquitous "gell
> cell" for use in our sailplanes? > >> > I have a lot of experience with NiCd
> and Nimh chemistries and some> > experience with Lithium Polymer (LiPo)
> chemistry, all in reasonably harsh> > situations (operating environment, high
> charge & discharge rates, physical> > abuse, etc) - The current generation
> LiPo's are certainly far more tolerant> > of mishandling than what they were
> even 2 years ago. However, I don't know> > of anybody that has used any of
> these alternative chemistries in any> > sailplane battery applications.
> Anybody out there tried any different> > battery types?> >> > Alternatively,
> are any of you able to recommend specific manufacturer(s) or> > brands of
> Gell Cell based on proven performance in our operating> > environment.> >> >
> Many thanks,> >> > Wayne Hadkins> > [EMAIL PROTECTED]> > 0427 910 511> >> >>
> >> >> > _______________________________________________> > Aus-soaring
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