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Lipo pack 2 cell at 5.87V. Problems?

Lipo pack 2 cell at 5.87V. Problems?

Old 07-20-2008, 01:33 AM
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Questions?? Lipo pack 2 cell at 5.87V. Problems?

hello
I forget to charge my 2cell 2000mah lipo pack and the voltage went down to 5.87 V. I tried to recharge it but I got an error on the MRC 989 Super Brain, it says Error Voltage.
Did I hurt the battery?
How can I charge it again?
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Old 07-20-2008, 04:05 AM
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the pack fell below the 6v(3v per cell) safety limit set by the lipo charge mode. You must set the charger in nimh mode 6 cell at .3 amp.
Charge the pack until it reads more than 6 v....You must watch this step because if the pack gets more then 8.4v you will cause a fire.....
Once the pack is above the 6 volts stop the charge and reset the charger for the lipo pack and charge like normal.
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Old 07-20-2008, 06:25 AM
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there's ur 1st issue. its specifically stated by most (if not all) lipo retailers to NOT CHARGE with MRC chargers. i know 1 person who has suffered 2nd deg burns and another sans his house b/c of those chargers and lipo. they say they can, they cannot. get rid of it or stop using lipo.

they keep changin/updatin their chargers to try and figure it out. quickly canning the old models after all the issues. play it safe and go another route (ie ICE or astro 109).

R
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Old 07-20-2008, 02:28 PM
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If you have any hope of reviving the battery, and want to keep your house or whatever, use a balancer for at least the first charge. When you run a lipo all the way down the chances of significant imbalance go up dramatically.
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Old 07-23-2008, 03:02 PM
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I charge it in NIHM mode as you said, and then switched to Lipo mode, the pack got back to life again.
That was a big fault of mine..
just for the balancer, what you guys recommend?
This pack don't have a plug to balance, but my others pack do.. just in case I want to buy the balancer to be safe.
thanks for all
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Old 07-23-2008, 05:40 PM
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Originally Posted by ultegrasti
there's ur 1st issue. its specifically stated by most (if not all) lipo retailers to NOT CHARGE with MRC chargers. i know 1 person who has suffered 2nd deg burns and another sans his house b/c of those chargers and lipo. they say they can, they cannot. get rid of it or stop using lipo.

they keep changin/updatin their chargers to try and figure it out. quickly canning the old models after all the issues. play it safe and go another route (ie ICE or astro 109).

R

I've never understood the appeal of those MRC chargers myself either? They look so 1984 tech.
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Old 07-28-2008, 08:16 PM
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Questions??

can someone recommend a lipo balancer that is compatible with the 989 Super Brain?
thanks a lot
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Old 07-29-2008, 10:28 AM
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I am thinking on this one
http://www.electrifly.com/chargers/gpmm3160.html
seems excellent, but I'm newbie with eletronics, therefore someone can tell me if it compatible with the MRC 989 Super Brain?

I also checked
Hyperion EOS LBA10 Network Blancer (6S/10A)

http://thunderpowerrc.com/html/cba-balancers.html
by Thunder Power

Need your advice guys
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Old 08-03-2008, 08:38 AM
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If you don't have a tap to balance it then you won't be able to balance it. I use a astro flight blinky and like it. If you don't have a way to balance it i would watch it while charging and take it off the charger when it reaches 8.4 volts .
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Old 08-03-2008, 09:37 AM
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The Equinox and LBA10 are the same balancer IIRC, and both are good ones.
Glad you managed to get your lipo back - watch it carefully the next few cycles to be sure there were no adverse efects from the overdischarge.
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Old 08-06-2008, 10:35 PM
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I have two packs of Protek RC that have a balancer connector, just need to indentify what is the connector type.

http://www.amainhobbies.com/product_...ducts_id/13508
http://www.amainhobbies.com/product_...ducts_id/16869

I also have 1 2 cell 1300mah Pack (no balancer connector) and 1000mah 3 cell
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Old 08-07-2008, 04:23 PM
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I'm using one of the 3300mah 3S Protek lipos AMain sells and it uses the same connector that Align, DualSky, E-Flight, Electrifly and others use. It is labeled "JST XH adapter". Here's a listing - tap config guide-

http://www.rcaccessory.com/pdf/Batte...on%20Guide.pdf
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Old 08-08-2008, 05:06 AM
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What i also like about the proteks they can be charged at 2c
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Old 08-09-2008, 07:17 AM
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Originally Posted by ultegrasti
there's ur 1st issue. its specifically stated by most (if not all) lipo retailers to NOT CHARGE with MRC chargers. i know 1 person who has suffered 2nd deg burns and another sans his house b/c of those chargers and lipo. they say they can, they cannot. get rid of it or stop using lipo.

they keep changin/updatin their chargers to try and figure it out. quickly canning the old models after all the issues. play it safe and go another route (ie ICE or astro 109).

R
I've been safely charging my lipos with a a MRC 977 and the MRC 969(upgraded to a 977) for over a year now. You just have to make sure you are in LIPO mode. That was good that the charger detected that the battery was below the minimum voltage. I would have done the same thing; just charge in NIMH mode a .3 mah once the battery is above 6vdc then stop the charge and continue in lipo mode.

If your battery does not have a balance plug there is no need to buy a balancer. Most transmiter lipos do not come with a balance jack because the current draw is so small that the batteries hardly ever have to balanced.

Not sure about receiver batteries. I believe the excess heat from either engine or speedo may warrant the need to balance the pack.

Commonsenserc sells a stand alone balancer for about $30.00 you just have to find the proper harness to matched the battery to the balancer.


Pass you soon...
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Old 08-09-2008, 07:21 AM
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Originally Posted by jeff1
can someone recommend a lipo balancer that is compatible with the 989 Super Brain?
thanks a lot
The MRC chargers can not change thru a balancer. but if your pack has a balance jack you can alway balance while you are charging or after the charge is done.
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