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HelicopterBeginners Corner › Lipo battery power level
11-30-2011 03:33 PM  5 years agoPost 1
Droog

rrNovice

Peru, MA USA

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Since I am told you shouldn't run a lipo battery all the way down, how can you tell while youre flying, when it has gone low enough and its time to stop? My copter is a coaxial and I don't know if it will shut down at a certain point so as to not run the battery too low. If not how can I find out. Or do I stop when the power seems to be fading?

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11-30-2011 04:18 PM  5 years agoPost 2
blackbird

rrVeteran

thessaloniki-Greece

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Use 80% of the lipo capacity,fly for 4 minutes then charge your lipo and see how many mah is going in and then devide to 4 , thats how many mah per minute is using your heli.If you have for example 1000mah lipo the 80% is 800mah, if you need 200mah per minute then your flight time is 800/200=4 minutes.

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12-15-2011 02:07 AM  5 years agoPost 3
MattyWhite

rrNovice

Fort Wayne, IN -​United States

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Hi Droog, You should stop when the power seems to fade. You feel or see it if your lipo is out of power. Or every time you fly you can estimate the life of your lipo battery.

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12-15-2011 12:35 PM  5 years agoPost 4
JOLT

rrVeteran

Baltimore, MD

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^Don't do that.

Blackbird has the right idea. Waiting till the power starts to fade is not a good idea.

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12-15-2011 03:38 PM  5 years agoPost 5
rexxigpilot

rrProfessor

Florida

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Hi Droog, You should stop when the power seems to fade. You feel or see it if your lipo is out of power. Or every time you fly you can estimate the life of your lipo battery.
You just described the fastest way to destroy a LiPo besides a crash! These batteries are not like NiXX technology. You don't ever want to run LiPo packs completely empty or they will get damaged. Stick to the 80% rule and you should get a good useful life out of a LiPo.

Unfortunately, most low priced coaxial helis don't come with properly set battery cutoffs. Most will allow the cells to run down to 3.5V or even 3.0V before they cut off power to the motor. That is too low and well beyond 80% (typically, around 3.75V rested). As blackbird mentioned, timing the flight and measuring the usage is the best way to determine how long you can fly.

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12-15-2011 09:45 PM  5 years agoPost 6
Funknrock

rrApprentice

San Marcos, CA

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What is the make of the heli?

if it's an Eflight heli it will have low battery indicators (usually flashing light). A heli with a battery you can remove and charge you can fly between 5-7 min depending on how many times you stop and start (read crash).

If it's a cheap 'mall toy' IMO, it really doesn't matter. You will most likely crash it beyond repair before the battery goes bad. I had one when when I first started (3ch micro) and just flew it till it the power started to drop and then charged it back up. It lasted about 3 months before I bought a good 4 channel.

My crashes are cooler than your flying! ;^)

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12-19-2011 03:10 AM  5 years agoPost 7
Newbe Guy

rrNovice

Phoenix, AZ

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stick with 80%. Blackbird nailed it. Do the math if you care about your stuff.

Blade mSR / Trex 450se V2 - AMA#965156

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12-19-2011 10:58 AM  5 years agoPost 8
Hicksy

rrApprentice

Mt Isa QLD Australia

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Blackbird's advise is of course spot on for every lipo out there, but in defense for Matty, almost every coax heli available comes with its own little plug and play charger,and if thats the case then how is Droog going to have any idea how many mAh he's taken out or needs to put back in?
Not trying to have a go at anyone who posted above, but realistically,
who is going to enter the hobby with a hundred dollar coaxial heli and straight up purchase a flash digital balance charger to go with it?
Droog if you're heli is using something like an 800mAh 2-cell 7.4v lipo, and you have one of the included bare bones chargers that come with most coax heli's, fly the heli for 3-4 minutes for the first few flights just to run it in, then you can fly a little longer untill you feel/hear the heli lose a bit of power and land straight away, then reduce your next flights by about 30 seconds. You'll more than likely still get many hours of fun from that battery.
If you've got a decent balance charger with a digital screen which clearly tells you whats going on with your battery, then by all means use Blackbirds instructions to the letter.

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