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Author Topic: DVD batteries  (Read 7310 times)

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Offline jbell

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Re: DVD batteries
« Reply #30 on: November 23, 2010, 08:20:41 PM »
I have the first bid!  I would appreciate it if a TSer doesn't drive up the price on me. 
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Offline sunjan

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Re: DVD batteries
« Reply #31 on: November 24, 2010, 03:52:26 AM »
You can't just look at the cash you lay out.  You also have to factor in cycle and calendar life.  While the initial expenditure of LiFePO4 batteries seems high ($1.42 per Watt-hour is what I just paid) they are actually cheaper than lead-acid or regular lithium batteries due to greater cycle and calendar life.  Also, safety is worth paying for.

Good point. I'd imagine that something like this would work, although you have to craft your own tip and get a separate charger:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120649414373
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Offline Chuck

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Re: DVD batteries
« Reply #32 on: November 24, 2010, 08:59:51 AM »
Hmmm, I wonder if those can be paralleled? That's a lot of battery in a very small package.
Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
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kirk97132

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Re: DVD batteries
« Reply #33 on: November 24, 2010, 10:04:44 AM »
I'd think parrallel woul be fine then we could up the mAh rating to something respectable.  For the money I might just try it.


Offline burris

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Re: DVD batteries
« Reply #34 on: November 24, 2010, 10:07:55 AM »
You also need a protection PCB so I wouldn't buy any battery from an RC plane/heli/car vendor unless I was prepared to disassemble the pack and rebuild it.   The plastic poly packs are also prone to damage so you would need a case or at least a bunch of shrinkwrap to finish the pack.  I prefer the cells in cans for that reason.

I'm using one each of these packs for DR-680, ST350, and AD2K.  They also have them pre-wired with a couple of different plugs.  I have smaller 6V packs for Lunatec V2 and  5-volt regulator/USB cable.

http://www.batteryspace.com/lifepo426650battery128v3300mah42wh7aratewpcb.aspx

I do value my time so this time around I decided not to buy the cheapest cells from eBay and make my own packs.  It took me long enough to solder connectors to the packs, chargers, and cables.  At the same time I did this I also changed all the connectors on everything I have so the 6V packs/chargers/cables had one type and the 12V packs/chargers/cables had manother type to I can't accidentially plug the wrong battery into the wrong thing (especially charger.)  I don't plan to redo my batteries again for at least 5 years though.

Offline Chuck

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Re: DVD batteries
« Reply #35 on: November 24, 2010, 10:28:14 AM »
I'm using one each of these packs for DR-680, ST350, and AD2K.

How much runtime are you getting on the DR-680 with one of those?
Is the amp rating accurate? Being so small I'd assume the stated rating is an bit of an exaggeration.
Reality is merely an illusion, albeit a very persistent one.

Microphones: Microtech Gefell M300, AKG C 480 B comb-ULS/ CK 61/ CK 63, Sennheiser MKE 2 elements, CAD GXL1200 (cardioid and mod-cardioid capsule & electronics mod), Audix M1290-o, Micro capsule active cables w/ Naiant PFA's, Naiant MSH-1O, Naiant AKG Active cables, Church CA-11 (cardioid), (1) Nady SCM-1000 (mod)
Pre-amps: Naiant littlebox, Naiant littlekit v2.0, BM2p+ Edirol UA-5, Church STC-9000
Recorders: Sound Devices MixPre-6, Tascam DR-680, iRiver iHP-120 (Rockboxed & RTC mod)

Recordings on the LMA: http://www.archive.org/bookmarks/ChuckM
Recording website & blog: http://www.timebetweenthenotes.com

Offline burris

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Re: DVD batteries
« Reply #36 on: November 24, 2010, 10:37:05 AM »
The manual says the DR-680 consumes 9 watts and a 12.8V/3.3aH battery has 42.24 Watt-hours of energy, so it should power the DR-680 for about 4.69 hours.


Offline burris

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Re: DVD batteries
« Reply #37 on: November 24, 2010, 10:42:42 AM »
oh yeah that jibes with your (Chuck) experiment with 2.45 aH NiMH's that lasted about 2.33 hours (2.45aH * 1.2V * 8 = 23.5 Watt-hours, you actually got about 10 watts of load.)  It will vary depending on what mics you are using since different mics consume different amounts of power, and it will be longer if you're using line input.

 

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