any merit in running dual battery packs ?

[Anthony Romano]

You could just check each battery with a loaded esv before and after each 
flight

>From: Tom Simes <nsrca at shinymetalass.com>
>Reply-To: discussion at nsrca.org
>To: discussion at nsrca.org
>Subject: Re: any merit in running dual battery packs ?
>Date: Mon, 24 Jan 2005 13:28:31 -0900
>
>On Mon, 24 Jan 2005 14:45:32 -0500
>"Dean Pappas" <d.pappas at kodeos.com> wrote:
>
> > LEDs have large voltage drops. Something more interesting would have
> > to be done. You have to figure out what is most likely to fail. My
> > high-falutin' analysis, done ages ago, showed that switches and
> > connectors are the worst culprits. I use one battery withtwin leads,
> > and cvarry the twin leads all the way to the RX. Of course, I don't
> > buy the cheapie batteries. Hello SR! Dean
>
>So I can see that your method likely reduces the probability of failure,
>but as far as I can see you still have no indication that a failure has
>occurred in the primary system until a failure occurs in the secondary
>system as well - although when the notification occurs it's a doozy!
>
>Checking Digikey it looks like even the high efficiency LEDs are
>still in the neighborhood of 2 V forward drop and the drop is fairly
>consistent across their operating current range (darn physics!).
>
>It looks like one might be able to use something in the TI TPS61010 thru
>TPS61016 family to drive the LED (although obviously at the cost of
>increased input current).  Or what about using a dropping resistor and
>tapping the current flow downstream of the regulator with the lowest
>voltage setting?  Should I crawl back in my hole with this?  I'm just
>thinking that some kind of visual failure indicator would really be
>a beneficial addition to a two pack design.
>
>Of course that wouldn't show you that the backup pack had a failure
>while the primary pack was still operating...  Although you could have
>an LED on both regulators and as long as the expected one was on...
>Vague memories of statistics class, MTBF calculations and the effect of
>adding components to a system are starting to crop up about now...
>
>Nevermind, straight back to my hole it is - now where did I put that
>tinfoil hat?
>
>
>Tom
>
>_____________________________________________________________________
>
>        |  ,  |               Tom Simes
>---------(@)---------        AMA 230068
>         --|--                NSRCA 3830
>           '                  nsrca at shinymetalass.com
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