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Lipo vs Life Charging

Old 12-13-2016, 08:25 AM
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Suprawill1
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Default Lipo vs Life Charging

Hi All,
Are Life batteries the same as Lipo in that they need storage voltage? If so, what is the proper voltage to store? I have one in my transmitter but I've been using it off and on for programming. I might have it off for 2-3 weeks but still use it periodically.
Thanks for your thoughts.

Will
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Old 12-13-2016, 09:27 AM
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JetPlaneFlyer
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No, LiFe is much less sensitive of charge state so I'd not worry about it.
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Old 12-13-2016, 06:08 PM
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Suprawill1
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Ok, thanks JetPlaneFlyer!
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Old 12-14-2016, 09:59 PM
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dereckbc
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LFP what you call LIFE is more tolerant to over charge, but like any Lithium battery should not be fully charged or left in a fully charged state.


As for Storage Voltage is not going to work well with a LFP battery because the discharge curve is so FLAT. 3.3 volts to 3.2 volts is a 70% difference in SOC. Manufactures ship of LFP send them out at 60% SOC as measured with a Discharge Coulomb Counter. In other words a 100 AH battery has 40 AH removed for shipping and storage.

In the end 3.2 to 3.3 is range you want and only charge to 3.5 vpc for longest battery life. Charged to 3.5 vpc until saturated gets you to roughly 90% SOC, and never discharge more than 2.6 volts under load, or 3 volts open circuit. If you have a charged cell and inted to let it sit a while. Just discharge it a bit and not worry about voltage to much.

Fully charged to 100% will read 3.6 volts. At 3.4 volts is a quick ride to roughly 80 to 90% SOC. From 3.4 to 3.2 volts is a long ride down to 20% or so.
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Old 12-15-2016, 05:19 AM
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Suprawill1
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Hi Dereck,
When I received this Life battery, I charged it to 6.7v. (3.35/c)
When I turn on the transmitter, it still reads this or at least has been toggling between 6.7 - 6.6. Like I mentioned, I turn it on from time to time for programming but it can be off for up to 3 weeks. So in that span of time, you say I should discharge it a bit more, say, 3.2 - 3.3v?
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Old 12-15-2016, 05:55 PM
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dereckbc
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>= 6.4 to <= 6.7 is fine. Panic = <6.0

Stay away from the ends. As you can see, he charge/discharge curve of LFP is very flat, and using voltage to determine SOC is not of much use. Just stay away from the ends of the curve, especially 3 volts and less. Once you fall off the cliff is the point of no return.

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Old 12-15-2016, 07:51 PM
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Ok, thanks Dereck!
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