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 ebay blue batteries 
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Joined: Mon Apr 04, 2011 7:38 pm
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Post ebay blue batteries
I have a bunch of those blue batteries that everyone seems to use 6800Mah but I'm only gettting a few hours at most running the MX2 and dolly. Then when I charge them the green light on the charger never comes on. I've had a new set charging for more than 24hours and still no green light??? Anyone with experience.


Sun Nov 18, 2012 3:07 am
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Post Re: ebay blue batteries
I've only ever used one of those blue batteries, Always had trouble with it. I threw it out.

A 6800mah should run it for many hours, I've run my dolly for 10hrs and it still had juice left.


Sun Nov 18, 2012 8:16 am
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Post Re: ebay blue batteries
i have used many of them, i dont really pay much attention to the chargers as they only sometimes go green. Normally one 4800 MaH battery will last me nearly a whole weekend of shooting with Chronos 2.0

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Sun Nov 18, 2012 8:39 am
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Post Re: ebay blue batteries
No problems with my blue batteries however it may be the charger that is at fault?

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Sun Nov 18, 2012 11:44 am
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Post Re: ebay blue batteries
i got 2 of those.. they work great, and they are very light... the first thing i did is to throw out the charger and build one myself... much better... by the way one of the two chargers i had made a frying noise and never worked again... maybe is the same with yours...

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Sun Nov 18, 2012 1:12 pm
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Post Re: ebay blue batteries
Make sure the power switch on the battery is turned on while you are charging.
I used one for about a month before I realised I had never actually charged it.

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Sun Nov 18, 2012 2:16 pm
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Post Re: ebay blue batteries
Really! the battery needs to be on?

And how long do I need to charge for.


Mon Nov 19, 2012 1:48 am
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Post Re: ebay blue batteries
Rick-Allen wrote:
Really! the battery needs to be on?

And how long do I need to charge for.


I generally hook them up and charge them overnight. i would say 4-6 hours?

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Mon Nov 19, 2012 6:31 am
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Post Re: ebay blue batteries
I guess it rather depends on the charging current.

The charger of a 9000 mAh battery i just ordered is supposed to charge with 300 mA. If I'm not mistaken, this means it would take 30 hours to charge (9000mAh/300mA=30 h). So if the current of your charger should also be 300 mA, it would take close to 23 hours to fill up your battery.

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Mon Nov 19, 2012 7:12 am
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Post Re: ebay blue batteries
I dident realize the battery had to be on for the first week or so either :shock:


Mon Nov 19, 2012 7:19 am
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Joined: Mon Feb 20, 2012 2:43 pm
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Post Re: ebay blue batteries
Daniel Kelly Brown wrote:
I dident realize the battery had to be on for the first week or so either :shock:


Same here!! I thought i was the only one!!

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Mon Nov 19, 2012 5:13 pm
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Post Re: ebay blue batteries
Daniel Kelly Brown wrote:
I dident realize the battery had to be on for the first week or so either :shock:


Well now I understand why the green light never comes on. Charged it for a couple of hours yesterday right in front of my computer.

Thanks for the advice guys!


Tue Nov 20, 2012 12:09 am
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Post Re: ebay blue batteries
Hi guys,

9800mah vs 6800mah vs 4800mah...... which one should I get to power up my JSR controller for long hour use? Any good source in ebay that can be trusted?

Thanks.

Tommy


Mon Jan 14, 2013 7:59 pm
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Post Re: ebay blue batteries
No problems with this one .... 12V Rechargeable Li-on Battery 9800mAH Portable 4 CCTV

http://www.ebay.com/itm/12V-Rechargeabl ... 41577f8596

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Tue Jan 15, 2013 2:07 am
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Post Re: ebay blue batteries
unozig wrote:
No problems with this one .... 12V Rechargeable Li-on Battery 9800mAH Portable 4 CCTV

http://www.ebay.com/itm/12V-Rechargeabl ... 41577f8596


Thanks for the link,unozig. What do you think if I use Li-po battery for this purpose as well? Which one better?

Regards,

Tommy


Tue Jan 15, 2013 5:35 am
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Post Re: ebay blue batteries
The batteries are O.K. but you should not expect the capacity printed at them ;-)
I mesured two of the "YSD-12900" with 9000mAh (looks similar to the one at ebay) for a couple of times with a continous 1A discharge.
First thing - you don't get 12V but nothing surprising because of the special Cellvoltage of Li-Io. The batteries have a protection circuit - so no problems with short circuit or deep discharge (disconnecting at 9V).

11.7/11.8V at the beginning, after 90 min 11.0 V left and after 3h 30min to 3h 45min the end at 9V - capacity: 3500 to 3800 mAh!! But anybody here to expect 9000 mAh at this price?

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Thu Feb 21, 2013 9:21 am
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Post Re: ebay blue batteries
Guys, seriously ? not switching on the battery when charging ? :)


Ok, i had to read it somewhere on the internet to figure it out myself. I was more worried with the charge time, it's looooooooooonnnnnng. Sometime more than 24h

I was wondering if i could use my B6 charger to charge these blue brixx in a more efficient manner, any idea ?


Sat Feb 23, 2013 2:32 am
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Post Re: ebay blue batteries
DrMacabre wrote:
Guys, seriously ? not switching on the battery when charging ? :)


Ok, i had to read it somewhere on the internet to figure it out myself. I was more worried with the charge time, it's looooooooooonnnnnng. Sometime more than 24h

I was wondering if i could use my B6 charger to charge these blue brixx in a more efficient manner, any idea ?


If your charger has an output of say 500mA and the blue battery has a capacity of say 5 Ah then in theory you can charge it in 10 hours. However due to internal resistance and heat loss it will take around 25% more, so 12.5 hours. I wouldn't go any longer as you may "cook" the battery. In fact the higher the charging rate the lifetime of the battery shortens.
Trickle charging is the best so it's a balance which you have to take into account.

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Sat Feb 23, 2013 7:50 am
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Post Re: ebay blue batteries
The B6 i'm talking earlier is a balanced charger we use for airsoft or RC with LiPO & Nihm, It can be used as well for Li Ion but this kind of battery is supposed to come with a second plug for balancing...

i'm unsure how i can charge the brick with it as an airsoft battery is only 2 wires, +/- and not like in this case, with separate plug for charging and powering devices.


Sat Feb 23, 2013 10:05 am
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Post Re: ebay blue batteries
With my charger I plug ( male connecter ) it into the socket ( female connecter ) cable of the blue battery then switch it on to commence charging.

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Sat Feb 23, 2013 1:51 pm
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