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Understanding LVC Targets for Lipoly Packs

Old 01-03-2006, 12:55 PM
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AEAJR
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Cool Understanding LVC Targets for Lipoly Packs

I am just now getting into Lipoly packs. I want to understand the low voltage cutoff targets on these packs.

I know below 2.5V will damage the packs. I have seen ESC with LVC preset at 2.75V per cell. I have heard that 3.0 is as low as we want to go.

So, is 2.75 a good LVC setting under the expectation that when the motor cuts off the cell voltage will bounce back to 3.0V?

For a settable ESC, should I be looking to set around 2.7 or 3.0.

I would appreciate any input or references. The planes currently have non-lipoly knowledgable ESC so the LVC are wrong. I will have to monitor this manually until I change the ESC.

Thanks for any insights or references you can provide.
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Old 01-03-2006, 01:48 PM
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olmod
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I have read that for high C rate lipo's that 3 v is a must you can get away with lower volts on low C rate packs, cheers.
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Old 01-03-2006, 02:01 PM
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Look at this discharge graph from RD Blakeslee. You can see that once you reach 3.2V under load , there is very little capacity left in the pack. It would be just a matter of a minute or less before the pack is completely spent. The only reason for using a LVC less than 3V (or higher) is if one is using cells that can't maintain voltage under high load like some of the old generation lipo's or some manufacturer's cells that need to warm up before they will hold a reasonable voltage. This is a rare occasion with most modelers however.
http://www.rcgroups.com/forums/attac...hmentid=448963
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Old 01-03-2006, 02:28 PM
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Thanks Hoppy. Interesting chart and insight into the nature of Lipos.
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Old 01-03-2006, 11:19 PM
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heartbeat
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hi i am also new to this e-flight ------where in the world can you find 11.1v li-pol 1000 mily amp batterys . not on e-bay or the two hobby shops I go to (please help) (rember to always use your elevator when landing)-----------------------HEARTBEAT
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Old 01-03-2006, 11:23 PM
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Rugar
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Originally Posted by heartbeat View Post
hi i am also new to this e-flight ------where in the world can you find 11.1v li-pol 1000 mily amp batterys . not on e-bay or the two hobby shops I go to (please help) (rember to always use your elevator when landing)-----------------------HEARTBEAT
You can get them here.
http://www.maxamps.com
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Old 01-03-2006, 11:42 PM
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You might also try:
http://xushobby.com
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Old 01-04-2006, 12:30 AM
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heartbeat
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Thanks You Are#1 A Ok.
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Old 01-04-2006, 12:55 AM
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Hobby lobby, Tower hobby just about any of the online hobby shops will have what you want. Do a Google search for Lipoly battery and have at it at it. Foundthis one at Hobby Lobby just did a quick search.
http://www.hobby-lobby.com/honeybeeking.htm
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Old 01-04-2006, 12:57 AM
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1

Last edited by Lazyflier; 01-04-2006 at 04:04 AM. Reason: duplicat post
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Old 01-04-2006, 01:08 AM
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Thanks But I Found Them At Xus Hobbys And Cheper To Thanks Again (heartbeat)
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