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› Noob with Lipo usage Questions, Please help!
08-11-2007 02:58 PM  10 years agoPost 1
Ed1955

rrApprentice

Pocono Mountains, PA​ USA

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I'm pretty new to this great hobby and one thing that is still confusing to me is how low can I drain my batteries in flight? Right now I'm using two different batteries, Thunder Power 11.1 2100 15C's and DN Power 11.1 2150 20C's. Is there a sticky that explains this in layman's terms. I'm also using a FMA Cell Pro 4S balancing charger but can't find anywhere that explains what is safe as far as total use or drainage. The paperwork for the DN's has a column for "Cut-Off Voltage" and I'm not even sure what that means. The charger shows how low in percentage that I've drained the battery. In general, what is a safe level and also how do you break in new batteries? Any and all help on this topic will be greatly appreciate and probably save me some battery money!
Respectfully,
Ed

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08-11-2007 03:39 PM  10 years agoPost 2
MrMel

rrProfessor

Gotland

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80% rule is what we use.

However, if you have overdrained it, even just once, it will have taken damage (it will have less capacity left), so then you probably want to lower the number.
Age will also take toll on your battery, so lower 5% per year.

Sidenote: There is new batteries from Airthunder and Kongpower which you can over-discharge without ill-effects.

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08-12-2007 01:53 AM  10 years agoPost 3
fenderstrat

rrProfessor

Aston,Pa

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However, if you have overdrained it, even just once, it will have taken damage
what is your definition of "overdrained it"?

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08-12-2007 02:31 AM  10 years agoPost 4
smcbmw

rrVeteran

Louisville, Kentucky

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I would never drain below 3.6volts PER cell. Get a good charger that tells you the voltage and the amount of mah (milliamps) you take and put back into the pack. no more than 80 percent of the mah should be taken out....

10-8

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08-12-2007 03:22 AM  10 years agoPost 5
MrMel

rrProfessor

Gotland

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what is your definition of "overdrained it"?
Thats the thing, you dont know exactly therefor a good practice is to safe it with 80%.

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08-12-2007 03:37 AM  10 years agoPost 6
fenderstrat

rrProfessor

Aston,Pa

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its just you were giving a newbie the impression that taking a battery to 81% will cause damage...80% is a good rule to shoot for and follow as a regular practice, but if you go over(a little) once in a while it wont do any damage....I actually took my batts to 90% a couple of times by accident they have over 200 cycles on them and are still at 100%...but I balance every charge and NORMALLY dont go past 80%.......these next generation batts along with the charger technology that has caught up are WAY more rugged than the first generation batts/chargers

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08-12-2007 04:10 AM  10 years agoPost 7
MrMel

rrProfessor

Gotland

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Problem is there is too many factors, so going 81% one time could do it (so could 80% also of course)

For sample:
You charge using "fast charge" on your charger, your battery is only 96-97% charged.
You leave the packs for a week and dont top-up, even though lipo has low self-discharge, in a week it will still quite "alot".

so all of the sudden 90% would kill the pack.

So I say go 80%, lower that 5% per year due to aging.

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08-12-2007 04:20 AM  10 years agoPost 8
fenderstrat

rrProfessor

Aston,Pa

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well yeah if you add all those variables(not mentioned,but made up by you after the fact) to create that exact scenario sure. but in general, when using a fully charged battery, taking it to 85% ONCE IN A WHILE does no damage........I also have a feeling this is going to be a thing of the past VERY soon as the chemestry being used by KONG POWER and AIRTHUNDER very successfully right now, catches on to the rest of the industry....its a good time to be flying electric right now

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08-12-2007 04:37 AM  10 years agoPost 9
MrMel

rrProfessor

Gotland

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but made up by you after the fact
Que?...

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08-12-2007 04:40 AM  10 years agoPost 10
fenderstrat

rrProfessor

Aston,Pa

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the original post was a general question,then you "made up" a situation,had those variables been stated BEFORE, I would have answered differently

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08-12-2007 04:51 AM  10 years agoPost 11
MrMel

rrProfessor

Gotland

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??

I never stated in any of my posts WHY 80% rule was enforced until that one, there is several of more variables.

Oh well, never mind.

But here is a way for you to know AFTER the fact if you over-discharged it or not, if the resting voltage (10-20 minutes after use), if the resting voltage is below 3.7 volt then you over-discharged it, however, if damage is done or not is impossible to know, and if damage is done, how much...

Only way to really know is to do a full cycle on it, risk is you damage it while cycling though (Ive actually managed to do that...)

I wished it where a "fuel guage" on the cells that could count the electrolytes and their charge...

AT/KP is nice, they only need to go on a diet

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08-12-2007 05:12 AM  10 years agoPost 12
fenderstrat

rrProfessor

Aston,Pa

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its all good..I think we each know what the other was TRYING to say.sometimes its hard to put your thoughts into words and get it to sound the way you meant it

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