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Date: Wed, 07 Feb 2007 08:32:00 -0700
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Bill Dube <billdube@killacycle.com>
Subject: Re: [FlyRotary] Re: Finally built - 3.7 lb, 600 cranking amp,
  11.5 A-hr battery
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The cells lose 5% capacity for every 1000 cycles (80% depth of 
discharge) at room temperature. If you are OK with 50% capacity, (the 
replacement point for typical lead-acid batteries) then they will 
last 10,000 cycles.

         I would guess that the battery will last ten years (or more) 
with daily use. We shall see, however.

         Like every other battery, the self-discharge (loss of charge 
while stored) is temperature dependant. At room temperature they have 
a self discharge of about 1% per week. Colder is less. Hotter is 
more. You can keep them on the shelf for over a year and still be 
able to start the plane (as long as you don't have something draining 
power from them in the airplane.)

         You can charge them with most any charger as long as it 
doesn't go over 15.0 volts. You should check this with a voltmeter 
before you use the charger. Some cheap chargers will go over 15 volts.

         Charge to a voltage between 13.8 and 15.0 volts. Anywhere in 
this range is just fine. No need for anything fancy or special cycling.

Bill Dube'


At 05:30 AM 2/7/2007, you wrote:
>Bill Dube wrote:
>>         These are not the delicate Li-Ion cells that they put in 
>> your laptop or cellphone.
>Fair enough. Bill, it's common to develop a maintenance cycle for 
>lead acids. Because they lose capacity over their usage lifetimes 
>most people recommend replacement after a year or two of usage. How 
>do these compare? Assuming no 'abuse', how long will they last, and 
>should they be replaced on a schedule?
>
>Also, will they lose charge while stored, and how quickly compared 
>to a lead acid? Will a lead acid trickle charger work to maintain 
>these, or is something special required?
>
>Thanks,
>Chad
>
>
>--
>Homepage:  http://www.flyrotary.com/
>Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/

    _ /|        Bill "Wisenheimer" Dube'
   \'o.O'     <billdube@KillaCycle.com>
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        U
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