Espritmodel.com Telemetry Radio
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Old Nov 11, 2011, 09:39 PM
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The 3rd cell is down to 1.5volts. bizarre. I can put it on the revo Vxl and just not select lipo mode. I think the only difference is no lvc.
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Old Nov 11, 2011, 09:50 PM
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Be advised, it might puff, just a heads up in case the pack is a tight fit in the model.
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Old Nov 11, 2011, 10:03 PM
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Ok thanks.
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Old Dec 03, 2011, 12:53 PM
urs
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switzerland
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50-100

hi all
I completely ran down my spectrum-jr radio transmitter lipo batts...this I have done twice over the past 18 months...batt index showed zero nothing.the lipo charger showed the undervoltage screen even when I told it it was a 1cell lipo.I put the batt on to charge at 50m-iamp useing an old multicharger with several ,outlets with 25 50-100-500mi amps...left it on charge at 50 for 10 hours then at a hundred for 5 hours then connected it to my normal lipo charger which correctly recocnised it and corectly charged it...this brought my lipo back from the dead twice and have had no trouble since...this only in the low amp use of a transmitter...I wonderd if it would work with lipos I used for flying so IU didf some experiments on some old flight lipos...empteed 1-3s 2200 and 1 4s 3500 complete ly down first on a charger then useing a light bulb to finesh them of....then slow charged them at 100mi-am,ps for 10 hours and then fast charged and have since flown them 43 times since (the 2200 32 times the rest the 3500) and they give the same flying times as before...


draw your own conclutions give it a try ..all safty precautions must be aherd to--

urs
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Old Dec 20, 2011, 09:39 PM View Post
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Old Jan 13, 2012, 03:04 AM
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Hook your batt onto another 3s lipo for 5min than balance charge both. Works well.
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Old Jan 13, 2012, 11:49 AM
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nano battery

I have a strange acting 3s. It shows 4.19 4.20 4.17. I'm balancing it now. The battery has not preformed well. My Acromaster airplane won't hover at all with this battery. Any ideas on why this battery has no output?
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Old Jan 13, 2012, 12:59 PM
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If other packs of similar size will hover the plane, the simple answer is it's had it's day and needs to be retired.
Some ways to kill a battery:
Store at full voltage
Run till the LVC cuts in or lower.
Discharge at very high current rates.
or, simply, it has been run correctly for a lot of cycles and it's now just an old tired pack.
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Old Jan 14, 2012, 08:46 AM
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Thanks Hoppy. I've read alot here but nothing seemed to match my battery problem. I charged, balanced, and discharged/ recharged and nothing really seem to help. It shows 4.20v on all three cells but never has output power. It will only produce half power while flying so I afraid to use it much. I'm thinking it may short out something.
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Old Jan 14, 2012, 11:02 AM
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I've got a whole bunch of packs just like that.....charge up nicely but just can't provide good current levels anymore. I don't think there is a high risk with using them, they just aren't much fun.
How old are they?


IMO, Time to discharge and toss.
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Old Jan 14, 2012, 04:48 PM
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That pack was just bought in July and only used maybe twenty times! It's a nano-tech so I thought it would be a good battery. Oh well, that's the way it goes. I may use it in a park flyer sometime. Hey, when we talk about storage... how long do you normally leave a fully charged battery stored? It's getting to be winter time in the Louisville, Ky area and it may be a month or two before I can fly again. I can pull some out and fly if need be right? I mean if I hae them charged for storage this week and next week it's sunny and 50 well I'm fully charging and flyin'. Do you thinkthat hurts them any?

Amos
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Old Jan 14, 2012, 04:58 PM
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Personally I don't leave them fully charged for 24 hrs. I won't even leave them over night unless for some reason they are charged and I am certain I will fly the next day.
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Old Jan 14, 2012, 05:09 PM
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A fully charged pack degrades much faster than a 1/2 charged pack. A couple of days is my max.
I have a HK Quattro 4 channel chzrger and can have 4 packs ready to fly in under 30 min.
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Old Jan 15, 2012, 08:46 AM
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Awww man! That might explain why my packs don't last but one summer! I charge them when I'm done flying for the day so they will be ready for the week end. Lesson learned. I thought it was ok to have them fully charged for a month but from what you guys say... I'm toasting money! I thought it would be harder on them to storage charge then turn around the next day and full charge them.
Thanks Amos
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Old Jan 15, 2012, 09:05 AM
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In case it hasn't been said yet, you don't want to leave them discharged either. Store some where near 50% charged. And don't discharge them too low. Generally leave 20% in them at the end of a flight. I think that is somewhere near 3.7 volts/cell.
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