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Author Topic: 12V 6800mAh Li-On battery $26 on ebay  (Read 5454 times)

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Offline notlance

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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

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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? mics record

Offline drewloo

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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 »

Offline notlance

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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

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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  High quality batteries and they also have relatively affordable chargers that will actually properly charge and balance LiPo batts...
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