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› Whats wrong with my 11.1v Lipo?
11-29-2005 03:16 AM  12 years agoPost 1
ksninew

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Woodstock, IL

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I've been using this Lipo to fly my Blade CP for about 20 cycles, but
after the last charge the Lipo only has enough power for a few seconds
of flight. I checked the voltage and it's 11.9 volts which is what my
charger has always charged it to. I have another Lipo that works just
fine.

Is it dead or is there anything I can do to get it working again?

Thanks, Bob

Raptor 50 V2, Blade CP

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11-29-2005 07:57 AM  12 years agoPost 2
Rob_T

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A 3s lipo should be 12.6V when it comes off the charger- if you're only getting 11.9 your charger isn't giving you the full capacity of the battery (by quite a big bit!) However that doesn't explain why the battery is only now loosing power. Based on what you say, I'm afraid the most likely explanation is that your battery is worn out. With a good quality battery not being discharged too far you should get much more than 20 cycles, so you may be discharging the battery too far (I notice that FMA uses the term "zone of temptation" in some of their lipo info, that term describes it perfectly- the motor is still running so the temptation is to use more throttle to compensate for the motor slowing down instead of landing and recharging). Alternatively if the battery was in a "package bundle" it may have been cheap rather than great quality.

If you're lucky the problem may just be that one cell has got out of balance and performing a balance charge is all thats needed- but the odds are not good that that is the problem. You need a battery with balancing connections to do this (or you need the skills to safely connect up to each cell one at a time for charging). I've posted about balancing previously so use search to find out how to do this. (But I repeat- the odds are quite low that this will solve the problem).

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11-30-2005 01:39 AM  12 years agoPost 3
ksninew

rrNovice

Woodstock, IL

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Thanks for the info Rob. I don't know why I only got 20 cycles, I was always careful to stop using the battery as soon as I noticed a drop
in power. No balancing connection on this one so I'll try charging one cell at a time to see what happens.

I have a TP lipo that has two connections but I don't know if the second
connection is for balancing? When I got the battery I couldn't find any
info about the second connection. I have a Triton charger, is that a good
charger for lipo's?

Can you recommend a good lipo that has balancing connections.

Thanks, Bob

Raptor 50 V2, Blade CP

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11-30-2005 07:33 AM  12 years agoPost 4
Rob_T

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On TP batteries the balancing connection is a multi pin connector- on a 3S battery it has 4 wires going to it - this brings out each cell seperately for charging. But to add to the confusion some earlier TP batteries had a 'charge guard' circuit that prevents overcharging but doesn't balance - that has just 2 wires no matter how many cells there are in the battery and the connector at the end is a 2 pin JST connector. Count the wires and you'll know which it is.

The Triton is a good charger for use with micro helis, once you get used to its quirks. I have one and use it a lot (I have several chargers capable of charging lipos, including a Schulze that cost almost 4 times as much as the Triton. The Triton is the one I use most for my lipos.) You need to set the Triton to the 3S lipos setting which displays as 11.1V in the voltage selection. The Triton will charge to 12.6V despite what the cell selection says (yeah, I think thats illogical too!)

My favorite lipo battery brand is Tanic, and they have their "Tanic taps" which allow for balance charging. I use 3S 1050 Tanics on my HummingBird, and they work very well and seem to last very well (no detectable loss of capcity after a year). The TP "pro-lite" range of lipos also have balancing connectors, but my experience of TP is that their cells rarely measure up to the rated capacity when I test them and the longevity is dubious. (But many people fly them and like them so I may just be having bad luck with them...) Kokam also have balancing connections on their more recent batteries. Kokam was one of the first lipo brands in the US and seem to make good cells although my experience has been with their older generations only.

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