RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 4505 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 450 › LIPO Battery life on a 450
03-05-2008 04:31 PM  10 years agoPost 1
MattC

rrNovice

Tamworth, UK

My Posts: All  Forum  Topic

Hello,

I brought a trex 450SEv2 back in mid November, I started off with flight times of around 10-11 minutes and my flight time is slowly reduced to around 7 mins and my charging / balancing time has increased from 1 hr to 2 hrs. The biggest problem being balancing the used battery

Charging time, i'm using the following cycle
1) balance the used battery
2) charge
3) leave the battery to balance.

I've had about 70 flights with no crashes since i brought the heli with 2 batteries, thats 35 flights per battery. I'm pushing the heli a lot hard than back in November, so i can understand the reduced flight time but what is the average lipo life to the where they become troublesome to balance & charge ? Are there any cells which age better ?

I'm using the aplus lipo's 2200mah 25C and I've been impressed with the performance so far and they are showing no physical signs of age, no swelling or excessive heat after flying

Cheers

Matt

PM  EMAIL  Attn:RR  Quote
03-05-2008 04:38 PM  10 years agoPost 2
gravydrive

rrApprentice

Jacksonville, FL

My Posts: All  Forum  Topic

How much have you been putting into the packs after a flight? Have you been following the 80% rule? 10-11 minutes sounds like a LONG time for a 2200mAh battery. What are your throttle and pitch curves, and what pinion are you running? Stock motor?

I'm running the stock motor with 12T pinion, 100% throttle curves, and get 6.5 min-7min MAX before getting close to 80% on a 2200mAh batt.

Murphy's Law Denier

PM  EMAIL  Attn:RR  Quote
03-05-2008 05:05 PM  10 years agoPost 3
MattC

rrNovice

Tamworth, UK

My Posts: All  Forum  Topic

The charger has been putting back 2200 mah each time just takes longer upon each cycle, this is excluding what the balancer removes.

I've not been following the 80 % rule, I'm basically flying until i notice a loss in power but I'm not waiting for the esc cutout to start.

My setup

Throttle curve 100, 85, 85, 85, 100
13 tooth pinion
stock 450sev2 motor
align 35a speed controller

My charger

robbe power peak ultimate
robbe lipoly equaliser

I've not tach'd the headspeed but it sounds like the 3000 rpm region

My flying is not really 3d more acrobatics, so more loops, rolls, flips, stall turns, inverted hovering compared to back in november figure 8's & stall turns. So i can understand the reduced flight time.

Cheers

Matt

PM  EMAIL  Attn:RR  Quote
03-05-2008 05:16 PM  10 years agoPost 4
Darren Lee

rrElite Veteran

Woodstock, GA

My Posts: All  Forum  Topic

The charger has been putting back 2200 mah each time
I've not been following the 80 % rule, I'm basically flying until i notice a loss in power
You have likely ruined you packs. You can't fly 'em like that and expect them to last. It's taking longer to charge because the cells are being destroyed by over-discharge.

PM  EMAIL  Attn:RR  Quote
03-05-2008 05:44 PM  10 years agoPost 5
Zaneman007

rrElite Veteran

Texas - USA

My Posts: All  Forum  Topic

WOW, You are fully discharing the battery?

What is your voltage at the end of a flight?

Are you not getting a low voltage warning from the balancer?
balancing time has increased from 1 hr to 2 hrs.
Once again, WOW.

I would say that you are seeing signs.

Old Guys Rule!

PM  EMAIL  Attn:RR  Quote
03-05-2008 06:43 PM  10 years agoPost 6
helibird

rrKey Veteran

St. George, UT

My Posts: All  Forum  Topic

what is the average lipo life to the where they become troublesome to balance & charge ?
With the way you've been treating them I'd say you past their life I doubt you'll get more then 50 out of a pack flying until you feel the power reduction. Some batts supposedly can take that abuse but most can't.
I've not been following the 80 % rule, I'm basically flying until i notice a loss in power but I'm not waiting for the esc cutout to start.
Sounds like you have read what you need to do but just aren't following it.

Lipo life seems to vary a lot. The better you take care of them the longer they will last. The 430XL motor is pretty hard on batts. I fly mine for 4:30 seconds do an auto and I'm done, Generally put back in around 1650ma. I have one evo with 58 flights on it and it still feels brand new. I had two align 16C's last about 100 but that XL motor was just too much for them.

PM  EMAIL  Attn:RR  Quote
03-05-2008 08:07 PM  10 years agoPost 7
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

My Posts: All  Forum  Topic

I have a pack that I have charged 97 times and another 91 times, I noticed that they are not like new anymore but still serve my purpose. I always follow the 80% rule and I balance as I charge. It seems to me that the way you are treating your batteries you will need to replace them very quickly. I would like to know what kind of batteries could stand this kind of abuse.

Team Synergy, Rail blades, Team Scorpion, V-Team

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
03-05-2008 10:14 PM  10 years agoPost 8
MattC

rrNovice

Tamworth, UK

My Posts: All  Forum  Topic

Thanks for the advice, I'll be lowering my flight times

After use my battery voltage is usually 10V to 10.5V discharged, not under load and to be honest I've not heard of the 80% rule before. I've been consuise about not dropping the individual cell voltage below 3 volts and using the esc low voltage cutout to protect the battery, obviously this isn't enough

Sounds like your all getting a reasonable amount of cycles out of lipo's - just need to treat them a little better !

Is it worth upgrading the motor from the standard align ? Which motors are worth considering ?

Cheers

Matt

PM  EMAIL  Attn:RR  Quote
03-05-2008 11:40 PM  10 years agoPost 9
MattC

rrNovice

Tamworth, UK

My Posts: All  Forum  Topic

I now see the reason for the 80% rule !

PM  EMAIL  Attn:RR  Quote
03-06-2008 12:02 AM  10 years agoPost 10
efliernzrrVeteran - Hamilton, New Zealand - My Posts: All  Forum  Topic

I fly until my low-volt alarm starts to glow.

I set mine to 10v - which works for my style of flying. For someone doing hard aeros, the voltage can be lowered a little so it still goes of at approx 80%

I have over 100 flights on most of my packs.

Pete, Trex500, Trex600E, Streched 600, DSX9, DX7, Low-volt alarms - check the gallery for my alarms

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
WATCH
 1 page 4505 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 450 › LIPO Battery life on a 450
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Monday, June 18 - 12:39 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online