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HelicopterRadio - Servo - Gyro - Gov - Batt › Li-ions with Li-po charger
12-10-2004 03:42 PM  13 years agoPost 1
DjBac

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Athens/GREECE

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Is it possible to charge li-ion batteries with a li-po charger?

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12-10-2004 03:45 PM  13 years agoPost 2
longbow

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Westminster, Maryland

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I would not until you check the specifics. 90% of all fires or problems are caused by improper charging of Lio and Lipo packs. I fly Lio packs in my rcvrs and Tx's now and use the provided slow charger from Duralite with no problems. When folks start trying to "quick" charge these, this is where the problems start.

Good luck....

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12-10-2004 04:22 PM  13 years agoPost 3
Angelos

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nr Oxford, OX11, UK

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No because the cut-off voltage of the Li-Ion is less than the Li-Poly. Unless the charger is capable of doing both Li-Ion and Li-Poly and it is set correctly don't even try it. At the best situation it will damage the packs... I'm sure you know what is the worst!

Spartan RC R&D

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12-10-2004 05:10 PM  13 years agoPost 4
DjBac

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Athens/GREECE

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I have the charger from my duralites.. I suppose I can use the TX plug (11.1v) to charge a li-ion at 11.1v...
Could you please recommend a li-ion charger capable of charging bats at 11.1v?

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12-10-2004 06:48 PM  13 years agoPost 5
RCfun

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Denmark

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Wouldnt it just mean it would cut off at 4.1v/cell instead of 4.2v/cell. That will just result in a less than full charge. I would recon in maybe 70-80% full but not sure maybe less.
The only problem I can see is that they will have reduced duration during dischage.

By the way Im using the LiMn program on my Graupner Ultra Duo Plus 30 with no problems. It seems to be same program as what is needed for LiIo (the new duo plus has a program for LiIo) and it stops when reaching 12.6v for a 3 cell pack. I have a Polyguard safety circuit between the charger and the battery and it does not complain (it keeps each cell at a max of 4.2 volts).

Regards
RCfun.

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12-10-2004 06:56 PM  13 years agoPost 6
Angelos

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nr Oxford, OX11, UK

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RCfun,

DjBac enquired about "li-ion batteries with a li-po charger", not the opposite. The LiPo have higher voltage and thus the lipo charger will overchange the Li-Ion batteries.

"By the way Im using the LiMn program on my Graupner Ultra Duo Plus 30 with no problems"

Just one thing I have to say... Until one day your house is on fire and you will learn the hard way like many other people that you shouldn't do that.

Spartan RC R&D

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12-11-2004 12:42 AM  13 years agoPost 7
DjBac

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Athens/GREECE

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I've just discovered that my charger is for Li-ion bats...
but it has 3.6, 3.7 packsx2 or x3...
So it can charge li-pos too? I know some people (2) using this charger for li-pos!!!!

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12-11-2004 01:31 AM  13 years agoPost 8
Wyn

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Oregon, USA

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re: the Graupner Duo Plus:

I'm using the LiMn setting for LiPo also, it cuts off at 4.2 volts per cell. The LiIo setting uses 4.1 volts per cell. Verified with DMM that the voltages are correct (within 2 mv on a fluke 8060a). Read somewhere that LiMn has the same voltage cutoff as LiPo. Anyway, no problems noted, but use at own risk, etc.

Wyn

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