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HomeAircraftHelicopterBeginners Corner › Old Dog needs help with new tricks.
03-15-2015 12:40 AM  3 years agoPost 1
popadoc

rrNovice

oak ridge, n.c. usa

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Hi everyone. I am new to this forum and to Heli's, but not to R/C.
I have bought a used Blade 450 3D and a simulator. I am just getting to the hovering stage and trying to learn as much as I can every day. I have a question about charging my 2200 mAh 3 cell Li-po battery. Today after some practicing my bird would start to spool up then shutdown but wouldn't lift off the ground.It did this a couple of times, so I though the battery needed recharging, but when I checked the battery voltage and it was 9.48v. Does this sound right? this it my first Li-po and I am still learning. Sorry for the long post.

Thanks for any help you my give,

Popa

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03-15-2015 12:54 AM  3 years agoPost 2
dgoss999

rrApprentice

UK - Lancashire

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Fully charged, lipos are typically 4.2v per cell. When flat they drop down to around 3-3.2v per cell.

Your 9.5v 3 cell lipo is pretty flat.

You should invest in a plugin lipo checker. A little box you plug the battery balance plug into. It will tell you the individual cells voltage and the battery's % full. An invaluable little box..

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03-15-2015 01:47 AM  3 years agoPost 3
Gamb

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Belle Mead, NJ USA

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Dedicated LiPo Battery Charger
I presume you are using the charger that came with your Blade to charge the battery. They are not the best, and sometimes don't truly "balance charge" the battery. Lipo batteries need proper care. Since yours is a 3S battery, all three cells need to be balance charged. If one of the cells reaches the cut off voltage (4.2V), then the inexpensive chargers will shut off, and the other two cells may not be fully charged.

I would suggest investing in a dedicated LiPo battery charger. Most of them will give you a readout of the voltage on each individual cell, and will balance charge all the cells to the optimum voltage.

Your battery problems may also depend on the number of charge / discharge cycles you have on the battery. Lipo batteries will usually last from 100 - 200 cycles. I have found that the original E-Flite batteries are some of the worst, and I have only got about 50 - 100 cycles (using a Triton Balance Charger). If you have done a lot of flying, even short "hops" to hover, the battery maybe reaching the end of it's life.

Buy good (not the most expensive) batteries, and get a good balance charger.

Enjoy the flying.

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03-15-2015 02:16 AM  3 years agoPost 4
popadoc

rrNovice

oak ridge, n.c. usa

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Thanks for info. I will defiantly get a Liop checker.
I have new ( 3 cycle) Turnigy battery and a imax B6AC charger.
With this charger I can see all of the cells as they are charging and they seem to be getting a pretty balanced charge.

Thanks again.

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03-16-2015 11:37 PM  3 years agoPost 5
Bladecpnitro

rrApprentice

Ga

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If you check the battery with a meter it often won't match what the charger says. Also If you run Lipos down too low it can ruin them.

Sounds almost like the ESC is hitting low voltage cut off.
Depending on head speed flight times should be between 3 minutes and 7 minutes. I used to get 7 minute flight times out of low head speed hovering around the yard. Now I get 3min 10 seconds per flight at 3300 Head speed slinging 325's.

What I used to do is fly until I hit low voltage cut off land and shorten my timer just a little. Soon after the ESC hits Low voltage cut off the motor will shut down completely.

Do you have a timer set?

When you plug your lipo into the charger after flying, check to see what the voltage is per cell. It should be 3.8 V per cell or 11.4V over all. I forgot you may not have a charger that gives voltages.

If voltage is higher you can lengthen the timer a little bit until you find its landing at 3.8V per cell. You can go a little lower than that but its easier to just land there since that is storage voltage. That way you don't have to storage charge your packs unless you don't use some packs for unforseen reasons like weather crashes, mechanical issues, etc.

If its lower you have to shorten the timer to minimize the risk of shut down.

If its fixed don't break it.

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03-17-2015 02:45 AM  3 years agoPost 6
popadoc

rrNovice

oak ridge, n.c. usa

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I have set the timer in my TX to 3 min and will check the voltage after the next flight. It may be a while though, a wind gust caught me yesterday and I ended up tail end into the asphalt. About 8 different parts to replace and set-up.

Thank you for the advise.

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