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Re: Unexpected SD 722 Lithium Battery Failure (was SD 702 compact fl

Subject: Re: Unexpected SD 722 Lithium Battery Failure (was SD 702 compact fl
From: "Rob Danielson" danielson_audio
Date: Sat May 17, 2008 8:46 pm ((PDT))
Hi Bernie-
Perhaps you could try to recreate problem with
the same battery and then try another battery to
see if/how performance differs.  Reseat both
batteries before the tests.  No matter how
careful I am with managing my LiOn batteries,
their performance starts to vary after about 30
cycles-- even the Sony brand ones-- even when
only using a smart charger.

When its crucial to record for more than 20
minutes, I power my 744T on an external battery
pack and use the internal battery as back-up. My
744T runs much longer on 15 volts than 12. You
can also set the "shut-off" voltage lower, like
10 volts when you use the external DC input. I
hate to keep buying those $70 batteries and watch
them become unpredictable. Personally, I think
NiMH batteries have more consistent output after
30 cycles up to around 100. They are heavier,
though. Rob D.

At 4:53 PM -0700 5/17/08, Bernie Krause wrote:
>Same happened to me on my 722 a few weeks back. Battery was reading
>"full" at the outset =96 a large  lithium ion version that usually runs=A0
>for around 6 hours. Drained in 20 minutes but HD and CF contained all=A0
>the info recorded to the time of the power failure. Unfortunately,=A0
>didn't think to bring a backup so lost half of a decent dawn chorus.=A0
>Does anyone have any idea(s) wha's happening?
>
>Bernie
>
>
>On May 17, 2008, at 4:42 PM, Dan Dugan wrote:
>
>>  > I had a rather unfortunate incident this AM with my Sound Devices=A0
>>  702
>>  > and wondered if anyone here has experienced anything like this. I=A0
>>  was
>>  > out recording for an hour or so until the battery started to go. It
>>  > shut down as usual and I came in to listen/recharge. After=A0
>>  powering it
>>  > up it showed no audio files at all. I checked it from a card=A0
>>  reader on
>>  > the PC and got the same, and also noticed that all of the system
>>  > folders had been recreated at the time it was powered up. The amount
>>  > of space used and available is the same as it was before this.
>>  >
>>  > I ran the CF repair utility on the 702 and it recovered about 10=A0
>>  files
>>
>>  Were any of them from the session where it died?
>>
>>  I had my first power-fail Sound Devices experience a couple of weeks
>>  ago. I was recording all channels to hard drive on a 744 with a
>>  battery that failed. After about twenty minutes I started getting
>>  warning beeps in the headphones, and in a couple of minutes it was
>>  lights out.
>>
>>  I'm pleased to report that my files were there on the drive.
>>
>>  -Dan Dugan
>>
>>
>>
>
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>
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>SKYPE: biophony
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>------------------------------------
>
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
>Yahoo! Groups Links
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