Rob,
If I spend a week in the Ontario bush how many packs like this might=20
I need for
normal .. non continuous recording on a 722. How long will they hold=20
a charge if unused?
I was wondering , because I have some new NiMH AA's for a PCM 1 and=20
they don't seem to hold a charge for a long period of time when I'm=20
traveling. The 722 goes through batteries relatively quickly it seems.
I was thinking of constructing a battery belt similar to a video=20
camera or light source for an extended stay or buying a couple of the=20
Eco-charge batteries.
Any thoughts?
Greg Rademacher
On Sep 5, 2005, at 11:27 AM, Rob Danielson wrote:
> Sorry, didn't mean to send battery pack info yet. Tried to juggle to
> many things at once.
> You'll need a minimum of 10 cells, here's the info, complete this=20
> time:
>
> =3D =3D =3D =3D
>
> Costs is ~$190 for a very nice 12 volt battery pack with charger and
> requires soldering skills.
>
> 1) 10 high capacity (10,000 mAh) D size NiMH, rechargeable cells
> 1- 8 pack http://www.batteryspace.com/index.asp?
> PageAction=3DVIEWPROD&ProdID=3D711
> 2 -singles http://www.batteryspace.com/index.asp?
> PageAction=3DVIEWPROD&ProdID=3D709
> ~$65 total
>
> I've been using these cells in 3 battery packs for over a year with
> the 722 and 744 and I've never one down as I rarely record for over
> 24 hours straight.
>
> 2) You can mount the D cells in 3 of the 4-slot plastic battery sleds
> from Radio Shack or on line surplus electronics supplier and strap
> them together with good tape and slip them in the cardboard box the
> batteries came in.
>
>
> 3) Connector, Soldering & Cabling:
> To connect with the 722/744, you'll need a 4 pin HiRose Connector:
> #HR10-7P-4P Digikey part# HR100-ND "Insert "HR100-ND" here:
> http://www.digikey.com/ I think they have a $25 charge minimum, so I
> bought some extra.
>
> Pin 1 =3D negative ; Pin 4 =3D + (10-18 volts; I'm running 12 volts with
> above pack. You could use their smaller C size and still get many
> hours. The 722/744 will run on more voltage, but I've found the MAHA
> charger below is not as happy charging packs larger than 12 volts. I
> also charge in my car and the MAHA does not support larger voltage
> packs powered by 12VDC..
>
> I use high quality, rubber mic cable that's 3/16" diameter so the
> HiRose connector can get a good grip and provide excellent strain
> relief. The weight of the 722/744 can end up resting on this
> plug/cable, so care here is advised.
>
> The pins are tiny so take your time. Once, I goofed and wired the
> polarity backwards, but SD added idiot protection. The decks ignores
> the pack if the polarity is wrong.
>
> 4) High Capacity NiMHBattery packs are tricky to charge. I've played
> with three DIY designs and after having modest success, I spent $95
> on a MH-C777Plus-II charger.
> http://www.mahaenergy.com/store/viewItem.asp?idProduct=3D185 It can
> charge anything be it nicad, nimh, or lion-- very quickly and
> reliably. It will recondition old battery _packs_. This feature alone
> got me my $ back.
>
> It takes about 8 hours to charge on the the 10000mAH pack.
>
> Again, sorry about the incomplete first post! Rob D.
>
>
>
>
> --
>
> [Non-text portions of this message have been removed]
>
>
>
> "Microphones are not ears,
> Loudspeakers are not birds,
> A listening room is not nature."
> Klas Strandberg
>
>
>
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>
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>
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