>>Just stumbled over an announcement of a swedish firm for their "Long-life
>>Battery" called "OrangeTop":
>>
>>- closed lead battery type with spiral wound cells instead of traditional
>>flat ones
>>- no checking / topping up required as it does'nt leak or gas
>>- delivers same level of current as conventional units two or three times
>>its size
>>- life cycle between 9000 to 12000 cycles (compared to around 4000 for
>>conventional units)
>>- long shell life
>>- two year warranty
>>
>>Contact:
>>Gylling Optima Batteries AB
>>PO Box 742
>>18217 Danderyd, Sweden
>>Tel: +46-8-6223237
>>Fax: +46-8-6223290
>>refer to Electronic Product News 6/98, Info No. EPN 4056
>>
>> sorry, no e-mail or web access given
>>
>>HAND
>>Karl
>
>I hope this may be of interest - I don't know if the batteries quoted are
>at all suitable for aviation use, maybe someone else here has that answer.
>
>Also if there is anyone else here afflicted with "Ozwin" who knows how to
>make it reply to all, perhaps they could contact Karl
><100725.3150@compuserve.com> direct with advice. (If all else fails, Karl,
>try sending a _new_ message to the list address <europa@avnet.co.uk> rather
>than trying to reply to an existing message. I know this may foul up the
>threading for some types of readers, but at least it will save me or the
>Europa Club internet rep some time.)
Nothing really "new" here. The "jelly-roll" battery was patented
by Gates Energy Products in Colorado over 20 years ago . . . the
patents have died. For years, Gates produced the Cyclon series
cells in sizes up through 25 a.h.
About 10 years ago, Gates sold the tooling and process for the
larger spiral wrapped batteries to Optima Battery in Denver,
Colorado. Saw one of their batteries in my favorite autoparts
store last week.
Everything they claim about the battery is true (generally).
I'd be a tad suspicious of the "cycle" rating. The way
these numbers are gathered may have nothing to do with the
way the battery will be used in your airplane. Suffice it
to say, this is a re-encarnation of a proven technology
in a gas recombinant battery. They DO have phenominally
low internal resistance and are good crankers . . . but then
ALL gas recombinant batteries are good crankers.
If the dimensions and weights for the battery are attractive
to you in your application, there's probably nothing wrong
with the. The only battery I've seen by Optima here in the US
is about 35 a.h. and weighs in at about 40 pounds.
Given the size of engines going into most Europas, I wouldn't
loose much sleep over battery selection. A 10 a.h. battery
will crank fine . . you need to chose capacity so that your
alternator-out endurance with minimal equipment exceeds
fuel endurance when the battery is down to 1/2 new capacity.
Then it's time to replace it . . . no matter how well it
still cranks the engine.
Bob . . .
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