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HelicopterMain Discussion › Rules for LiFe Packs
09-01-2012 09:18 PM  5 years agoPost 1
wifeorheli

rrElite Veteran

reno, nevada usa

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well im recently running a LiFe pack for my setup im wondering what the rules are. Like with lipo you dont want to pull more then 80% out of the pack. I know the life flatline at a certain point just need to know when so i can breakdown how many flights! thanx

Novarossi Motors U.S.A
www.PlanetHobby.com
Team Align
GrandRc.com
ZRC U.S.A. "PushGlo, SwitchGlo"

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09-01-2012 10:25 PM  5 years agoPost 2
pctomlin

rrVeteran

Texas

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The best way to figure out how many flights you can use your LiFE battery for between charges is to fly for 3 flights and then recharge. Take the mah put back into the battery and divide by three for an average use per flight. Now you can figure out your 80% usage point to recharge. From the sounds of it from other posts about 300 mah seems to be the average use from a number of people.

Never hurts to monitor the LiFE cell voltage between flights too.

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09-01-2012 10:27 PM  5 years agoPost 3
bkervaski

rrElite Veteran

Birmingham, AL, USA

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LiFE packs will remain at 6.6v until they fall off so you really can't monitor the voltage between flights.

Just measure a couple flights and figure out your total.

Also, you don't have to follow the 80% rule on LiFE packs, the chemistry will hold up just fine.

But once they drop off ... they drop of hard, to the point where your gear may even go into failsafe.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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09-01-2012 10:49 PM  5 years agoPost 4
McKrackin

rrProfessor

Lucasville,Ohio

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80% is the safe bet.
They're fine to drain 100% but they will crash you at that point.lol.....

Stick with 80 and don't freak if you go over a smidge.

I literally never use the word literally right.

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09-01-2012 11:02 PM  5 years agoPost 5
BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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Just remember,you CAN'T check voltage/load test LiFe packs so if you get a bad one,you'll know it just like I found out..This was a brand new 6.6V LiFe pack which just come off the charger..

Watch at YouTube

Had a lock-out because the pack was bad..Took it back yesterday and had it replaced..Flew 2 flights in a row without issues today but I don't think i'll use it anymore because the thought of having another lock-out is scary as hell..No way to load test them or anything so if you buy a bad one or it starts going bad,you'll find out inflight like I did..

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09-01-2012 11:04 PM  5 years agoPost 6
McKrackin

rrProfessor

Lucasville,Ohio

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Don't use a really small one either.

I have a 1900mAh pack which is about the minimum you should use and I would only go two flights per charge with it.

I recently switched to a 3200mAh LiFe Sourse pack.

I literally never use the word literally right.

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09-01-2012 11:10 PM  5 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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Hey Lon...How did you decide that was a lock out?
You had control and landed it after it hit the ground once and I heard the throttle check while it was sitting there.

V Bar log say low voltage?

You were really taxing that little pack with pogos and piros and throttle and cyclic all going wide open at the same time.

I would think you need a bigger pack for that kind of flying.

I literally never use the word literally right.

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09-01-2012 11:23 PM  5 years agoPost 8
BladeStrikes

rrElite Veteran

Shelby TWP,Mi

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Because I tested the pack when I got home..Its not too small as ive been useing the exact same size pack over a year on my FB 700N,FBL 600E and FBL 700N..Always got 2 EASY flights on all my helis and could go 3 so the pack isn't close to being too small..A 1900mAh LiFe pack is good for 4 flights EASY,thats what I ran before going to the 1100mAh packs about a year ago.Them tiny pogos don't load the servos and isn't hard on anything,didn't come close to loading the engine...You can clearly see the pack is bad ----->

Watch at YouTube

Like I said,I already took it back yesterday and got the exact same pack..Also flew 2 flights in a row with it today like I always have with it and all was good but im not about to trust them anymore..

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09-01-2012 11:54 PM  5 years agoPost 9
McKrackin

rrProfessor

Lucasville,Ohio

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Cool.

I would still go bigger myself.

I got an AR7100 in the classifieds if you need it to go lipo.
We could talk price later.

I literally never use the word literally right.

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09-02-2012 01:06 AM  5 years agoPost 10
Heliguychris

rrKey Veteran

Perth, West Australia

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I have a Fromenco ion cube with the red cards here that charges them to 7.5 volts, but some much later life chargers that charge them to 7.2 volts, which is correct ?
Thanks.

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

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09-02-2012 01:11 AM  5 years agoPost 11
McKrackin

rrProfessor

Lucasville,Ohio

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7.2 is what mine hits.

I literally never use the word literally right.

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09-02-2012 02:05 PM  5 years agoPost 12
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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7.2 is the correct voltage, to the best of my knowledge, the Fromeco charger is meant for Li-ion and should not be used with LiFe.

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09-02-2012 03:51 PM  5 years agoPost 13
RyanW

rrKey Veteran

Edmond, Oklahoma

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The Ion Cube has dual capabilities. If you purchase the red charge boards, they are for the LiFe cells. They used to have two types, the full A123 "Iron Corp Extreme" and the smaller form factor "Iron Corp" cells.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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09-02-2012 05:03 PM  5 years agoPost 14
BobOD

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New York- USA

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OH NO...more RULES!

We have enough stinking RULES.

Team POP Secret

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09-02-2012 05:34 PM  5 years agoPost 15
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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You guys might find this thread interesting. Looks some people do reliably voltage check liFe batteries.

https://rc.runryder.com/helicopter/t707525p1/

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09-02-2012 08:42 PM  5 years agoPost 16
BobOD

rrElite Veteran

New York- USA

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I want a battery that catches FIRE before it drops low enough to brown out my RX. Do they make one of those?

Team POP Secret

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09-03-2012 10:48 AM  5 years agoPost 17
ch-47c

rrElite Veteran

san jose, ca

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I have one LiFe battery in a DX-7 that is 1800mah. At what voltage do I land and recharge? It sits at 9.9v a long time.

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09-03-2012 01:54 PM  5 years agoPost 18
Four Stroker

rrElite Veteran

Atlanta

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Hey guys, let's not confuse pop tart wrapper LiFe packs with the 30C A123 2300 packs. The 2S A123 2300 will fit in a TREX 600 sideways on the bottom and does not weigh much.

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09-03-2012 03:00 PM  5 years agoPost 19
Heliguychris

rrKey Veteran

Perth, West Australia

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Thanks for the info gents

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

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09-03-2012 09:05 PM  5 years agoPost 20
Richardmid1

rrProfessor

Leeds, England

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Ive found that according to Hyperions battery cell checker you can take Li-fe packs down to 0%.

I did a test on the ground with the cell checker still plugged into the balance lead and the display read 5%, I then wiggled the collective (3x Align 610's) like crazy to see what would happen, the pack would dip very briefly to around 5.6v but would hover around 6-6.3v. My 610's got warm before I reached the point where the pack dropped off! With Spektrum the pack needs to drop below 3.5v before you get a brown out. I will do further tests tomorrow to find out what voltage they really start to drop off.

60% of the time, it works every time!

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HelicopterMain Discussion › Rules for LiFe Packs
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