how long will A123 last in my application ?

how long will A123 last in my application ? (Full Version)

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Kraeuterbutter -> how long will A123 last in my application ? (2/20/2007 2:50:08 PM)
i see this values in my Heli: [img]http://www.kraeuterbutter.at/Bilder2/Acrobat10/Eagle%20Tree%20Messwerte/2nd_Flight_4s1p_FePO4_Acrobat10_Volt_Amps_big.gif[/img] [img]http://www.kraeuterbutter.at/Bilder2/Acrobat10/Eagle%20Tree%20Messwerte/2nd_Flight_4s1p_FePO4_Acrobat10_Watt_Cumul_big.gif[/img] the peaks of 90A+ are shorter max. 1sec long (or shorter) and as you can see seldom during one discharge its more like 60A peaks in general and 20A-25A average current at discharge i also don´t run the batts completley empty (because the heli comes down like a stone on that !) so: around 1800mAh discharged charing: 4A at home, 8A at the field what kind of lifetime can i expect ?!? more than 500 ?

A123 Racing -> RE: how long will A123 last in my application ? (2/20/2007 5:11:15 PM)
Hello, Thank you for using our batteries I hope you are enjoying the performance they offer in your heli. Based on our definition of end of discharge which is 15% capacity loss I would not expect to see 500 cycles on this pack, we would estimate 300-400 cycles, though our data in the RC heli application is limited. If you base your definition of end of discharge at 50% capacity loss then 500 cycles is possible. Brian, [image]http://www.a123racing.com/images/Animated-Banner_r0.gif[/image]

Kraeuterbutter -> RE: how long will A123 last in my application ? (2/21/2007 9:39:37 PM)
hey.. yes i was surprised.. work better than i expected compared to NiMh they are great ! if you want best power together with long runtimes there is of course still no way around Lipos unfortunatly i have killed my eagle-tree datalogger that same day.. so no more testing, only data of 2 days testing.. some thing i noticed: batts charged 1st time ... flown charged the warm batteries... made 2nd flight 30min after end of charging (batts slightly warmer than normal room temp) the values are the ones i have posted here after this flight charged again and flown 12hours later at the next day ---> the values looged were not that good as said: i had only this 3 tests, than smoked my eagle-tree my feeling: the A123 like it to use them imediatly after charging when lying around days the power is not that good anymore was that a mistake ? falls measurments ? ... thx

A123 Racing -> RE: how long will A123 last in my application ? (2/23/2007 9:25:38 PM)
Hello, I think you may have had something go wrong on hte second charge and or the thrid flight. Our batteires have an extremely long shelf life, they can be stored for months. The only difference you would see is that directly off a charger the batteries should be 3.6V / cell. If they are left to sit by htey will return to ther nominal voltage of 3.3V / cell, but even this should not be a drastic change becuase during use direclty off hte charger they will fall to niminal voltage pretty quickly. Brian Power . Safety . Life [image]http://www.a123racing.com/images/Animated-Banner_r0.gif[/image]

everydayflyer -> RE: how long will A123 last in my application ? (2/24/2007 1:58:44 AM)
The difference between warm from charging and room temp. can make a noticeable difference. See first attachment here http://www.rcuniverse.com/forum/fb.asp?m=5154318 Disch 20 and 35 room temp. others warm from charge, I now do all of my graphing right after a run and recharge so they are more consistent. Notice that in graph here http://www.rcuniverse.com/forum/fb.asp?m=5452102 I did not include discharge 20 and 35 as IMO they are not truely representative. Charles

Kraeuterbutter -> RE: how long will A123 last in my application ? (3/5/2007 11:40:34 PM)
A123 at 40A discharge, 20°C cell-temperature at start [img]http://www.rc-network.de/forum/attachment.php?attachmentid=59139&d=1170621501[/img] A123 at 40A discharge, heated with an hair-heater to 40°C [img]http://www.rc-network.de/forum/attachment.php?attachmentid=59142&d=1170621592[/img] more information: http://www.rc-network.de/forum/showthread.php?t=63180

Kraeuterbutter -> RE: how long will A123 last in my application ? (3/5/2007 11:46:22 PM)
here similar: both at 50A 20°C (red) vs. 50°C (green) [img]http://www.kraeuterbutter.at/Bilder2/sonstiges/FePo4_Temperaturverhalten.jpg[/img] temperature makes this cell A LOT better more info: http://www.rc-network.de/forum/showpost.php?p=588818&postcount=6

Kraeuterbutter -> RE: how long will A123 last in my application ? (4/17/2007 6:15:56 PM)
after 40 cycles cell work great.. meanwhile regeared the heli and using 5 instead of 4 cells.. to have a little impression, here a video of the heli with 5s1p A123 FePO4 http://www.kraeuterbutter.at/Videos2/Acrobat10_5s1p_FePo4_kleinere%20Version.avi runtime with around 5min is a little short, but fast charging makes this negativ point become very small...

adamd11pl -> RE: how long will A123 last in my application ? (4/18/2007 10:03:15 AM)
Hi Kraeuterbutter, I fly with 12s2p and I'm very hapy with them. When I try 12s1p setup, I get very hot (55-60 C range) pack. How hot is yours pack after flight? I get 60A in peak on 12s2p and 50A on 12s1p. Thats almost your power range. regards Adam PS first graph - 12s2p second graph - 12s1p

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