Become a Site Supporter and Never see Ads again!

Author Topic: 12V 6800mAh Li-On battery $26 on ebay  (Read 4496 times)

0 Members and 1 Guest are viewing this topic.


Offline notlance

  • Trade Count: (6)
  • Taperssection Member
  • ***
  • Posts: 696
  • Gender: Male
Re: 12V 6800mAh Li-On battery $26 on ebay
« Reply #1 on: May 16, 2012, 05:21:08 PM »
Well, I bit.  I'll let y'all know how it works out.

Offline Colin Liston

  • Trade Count: (8)
  • Needs to get out more...
  • *****
  • Posts: 2200
  • Gender: Male
Re: 12V 6800mAh Li-On battery $26 on ebay
« Reply #2 on: May 19, 2012, 09:01:18 AM »
Would that work with an Apogee AD1000?
Occasionally....music mics record

Offline drewloo

  • Friend of Salsa
  • Trade Count: (5)
  • Needs to get out more...
  • *****
  • Posts: 3027
  • it's recreational
Re: 12V 6800mAh Li-On battery $26 on ebay
« Reply #3 on: June 02, 2012, 10:25:45 AM »
I bought a similar battery on ebay and am sad to report that it isn't exactly as was advertised.   I have to put part of the blame on me since I didn't realize that the battery was about the same size as an m-10 even though the dimensions were correctly listed in the description.  Should have been skeptical from the start just from size of the enclosure.  There are only 3 cells in the battery so I believe it's really an 11.1V battery being sold as a 12V.  There was no writing on the cells but I'm guessing they're about 2000mAh based on similar cells w/ similar dimensions.   

The instructions said to charge it until the green light on the charger went off and could take over 8 hours.  Which it did.  It came w/ one connector which fits a dr-680 perfectly.  At full charge the battery showed 12.7V.  Connected it to the dr-680 running 2 mc930 mics, 2 channels, and hit 'record'. 

Full charge = 12.7V
1 hour       = 11.8
2 hours     = 11.1
3 hours     = 10.77
4 hours     = 10.44
4.75 hours = 8.4   DR-680 continued to record but there were no levels at all so I guess the voltage wasn't enough to power the    phantom circuitry. 

Here are some pics.  The black specs are bits of plastic sticking to dual-sided tape from having to use a hack saw to open the enclosure  since I could only get one of the 4 screws out w/ a screwdriver.







So, advertised as a 12V 6800mAh battery it's actually more like a 11.1V ~2000mAh battery.  Ran a 680 at 2 channels for over 4 hours.  Not bad for less than $23 I guess.  I think if I were to buy another LIPo battery for the 680 I'd go w/ this one
« Last Edit: June 03, 2012, 08:47:15 PM by drewloo »
You can't be a real country unless you have a beer and an airline - it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer.  -FZ

Offline notlance

  • Trade Count: (6)
  • Taperssection Member
  • ***
  • Posts: 696
  • Gender: Male
Re: 12V 6800mAh Li-On battery $26 on ebay
« Reply #4 on: June 11, 2012, 07:44:39 PM »
Here’s my report on this “6800” mAhr battery.  It cost me $26 shipped.

When I received the battery, direct from China, I was also suspicious of its capacity.  Not from its size, but from its weight.  I realize Li-ion batteries are light for their capacity, but this thing is only 206 grams (7.25 oz).  Nevertheless, on with the test.

I charged the battery fully, and it had a no-load voltage of 12.7 V.  I connected it to a Sound Devices 722, connected a couple of condenser mics (actually a Nevaton MC404 stereo mic).  The loaded voltage dropped to 12.4 V, and during record there was 0.7 A flowing.  I let the 722 record until it shut down, which took 4:32.  Let’s call it 4:30.  (At shutdown, the battery was at about 9 V; it’s not good for a 12V Li-ion battery to be discharged that far.)

So that means my sample of this battery is:
4.5 hours x 0.7 A = 3.15 Ahr = 3150 mAhr

I really ran this battery down to get to 3150 mAhr, so in use I’d rate it to be no more than 3000 mAhr.  That is 3000 / 6800 = 44% of its rated capacity, which is pretty bad.

There is more bad news.  When I used the included wall wart battery charger to charge my now deeply discharged batter, the charger blew up!  The outside plastic case of the charger was deformed from overheating.  I took the charger apart and the plastic case power transistor (without a heatsink) had split into pieces.  Obviously, the charger busted a gut trying to recharge the very dead batter.

I sent an email to the seller, explaining that the charger had blow up the second time I charged the battery, and he said he is shipping a new battery and charger.  I have no doubt I’ll get it.  When it comes I’ll take the charger apart and add a heatsink, run it outside its case, and maybe use a fan when charging.

I can find a use for this battery, but would I buy one again?  Nope.

Offline phanophish

  • Trade Count: (2)
  • Needs to get out more...
  • *****
  • Posts: 2125
  • Gender: Male
    • ImageLume Photography
Re: 12V 6800mAh Li-On battery $26 on ebay
« Reply #5 on: June 11, 2012, 10:45:40 PM »
If you guys are looking for high capacity LiPo batteries check out HobbyPartz.com.  High quality batteries and they also have relatively affordable chargers that will actually properly charge and balance LiPo batts...


http://www.hobbypartz.com/60p-dyc-1003.html

http://www.hobbypartz.com/98p-25c-5500-3s1p.html
______________________________________________
Audio: MBHO 603/KA200N or AKG C2000B>Edirol R44
http://www.archive.org/bookmarks/phanophish

Photo:  Nikon D300, D200, 35mm f/1.8,  50mm f/1.4, 85mm f/1.8, Nikon 17-55 f/2.8, Sigma 18-50/2.8 Macro, 18-70 f/4.5-5.6, 24-120 f/3.5-5.6 VR, Sigma 10-20 f4-5.6, Nikon 70-200 f/2.8VR, SB-800

Jake: What's this?
Elwood: What?
Jake: This car. This stupid car. Where's the Cadillac? The Caddy? Where's the Caddy?
Elwood: The what?
Jake: The Cadillac we used to have. The Blues Mobile!
Elwood: I traded it.
Jake: You traded the Blues Mobile for this?
Elwood: No. For a microphone.
Jake: A microphone? Okay I can see that.

 

RSS | Mobile
Page created in 0.18 seconds with 33 queries.
© 2002-2018 Taperssection.com
Powered by SMF