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Jun 07, 2011, 02:58 PM
Registered User
Question

LiFe batteries


I am looking at batteries for a small parkflyer I am building. LiFe seems to be the best option as it seems to be much more stable than LiPO. I was wondering if anyone could give me advice on brands of ESC's that accept LiFe chemistry.

Thanks alot. Will
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Jun 07, 2011, 03:38 PM
The Sweet Aroma of Fuel
electricrc68's Avatar
which life batteries are you purchasing?
Jun 07, 2011, 08:10 PM
Registered User
http://www3.towerhobbies.com/cgi-bin...?&I=LXAAGM&P=0

This is the one i am looking at. Im hoping that its not too heavy
Jun 07, 2011, 10:59 PM
just look at it smokin'
z-matrix's Avatar
Quote:
Originally Posted by whrockshalo View Post
http://www3.towerhobbies.com/cgi-bin...?&I=LXAAGM&P=0

This is the one i am looking at. Im hoping that its not too heavy
you need more than that to lift a plane off ground, that is the cheap copy of the A123 cells able to handle max. 1C discharge, and a 0.5C charge rate.
Jun 08, 2011, 01:18 AM
Zero Expo
typeRA's Avatar
A better option would be a 2S pack of 18650 A123 cells.
Jun 08, 2011, 11:03 AM
Registered User
http://www3.towerhobbies.com/cgi-bin...?&I=LXYAS7&P=0
How about this one? it has a 10c discharge rate
oh and any recommendations on ESC's?
Jun 08, 2011, 11:03 AM
Registered User
flydiver's Avatar
Most LiFe cells except the A123 brand may not have the output for power use. The one you linked to is for RX applications.

In addition there are only 2 A123 sizes, 2600 and 1100. The 2600 cells really need a 3# plus weight to be useful and the 1100 don't have the power/weight ratio to be all that good in smaller park fliers, say under a pound. I used them for awhile but seldom do now.

Just learn the rules for proper lipo care and you'll be fine.
Jun 08, 2011, 11:12 AM
Registered User
thanks alot for your help

would this battery be the right start? again idk about weight
http://www3.towerhobbies.com/cgi-bin...?&I=LXVLP0&P=0
Jun 08, 2011, 02:28 PM
Registered User
http://www.hobby-lobby.com/2_cell_7....33744_prd1.htm
actually this is probably more what i am looking for to power a 350 brushed motor and some servos
Jun 08, 2011, 04:16 PM
Registered User
flydiver's Avatar
First link is another receiver (low power) battery. Not suitable for power.

2nd link is a lipo power battery. It may work depending on your actual application.....which is?
Jun 08, 2011, 11:55 PM
Registered User
please reconsider lipos.. as of today, has higher power to weigh ratio, they're more readily available, convenient and price wise its cheap now a days..

if you follow the simple protocol of lipo safety, you will be in safe hand.. don't forget alot of consumer products that we uses today like your cellphones and laptop uses lipos instead of life/a123

check this link from another person who has fear of lipos
https://www.rcgroups.com/forums/show....php?t=1451239


Quote:
Originally Posted by whrockshalo View Post
I am looking at batteries for a small parkflyer I am building. LiFe seems to be the best option as it seems to be much more stable than LiPO. I was wondering if anyone could give me advice on brands of ESC's that accept LiFe chemistry.

Thanks alot. Will
Jun 09, 2011, 12:04 AM
just look at it smokin'
z-matrix's Avatar
Quote:
Originally Posted by yurstruly View Post
please reconsider lipos.. as of today, has higher power to weigh ratio, they're more readily available, convenient and price wise its cheap now a days..

if you follow the simple protocol of lipo safety, you will be in safe hand.. don't forget alot of consumer products that we uses today like your cellphones and laptop uses lipos instead of life/a123

check this link from another person who has fear of lipos
https://www.rcgroups.com/forums/show....php?t=1451239
Li-Po 110-150Wh/kg
Li-Fe (A123) 96-108Wh/kg

drawback is original A123 comes in cylindrical form, only huge 10-20Ah cells are prismatic.
Jun 09, 2011, 03:20 PM
Southern Pride
everydayflyer's Avatar
There are many prismatic LiFePO4 cells but most are not really capable of the discharge rates claimed by them. A few example here

http://www.hobbyking.com/hobbyking/s...8&ParentCat=85

Back several years ago I tested many LiFePO4 cells / batteries and only the original A123 Systems ones were really suiable for high amp. outputs.


Charles
Jun 11, 2011, 05:48 AM
Registered User
ggroyal1117's Avatar
Hey Charles,
I am thinking about trying two of these LiFe batteries in series. They are rated at 30C. Also, they are very thin. What do you think? Our club (SMRCF) is about 75% electric and they like to try new batteries.
Thanks,
George Royal
Secretary/Treasurer-
Stone Mountain Radio Control Flyers
Jun 11, 2011, 09:29 AM
Registered User
There have been several reports of horrible performance from Hobby King LiFe prismatic packs, especially when compared to an inexpensive lipoly. IMO, ordering those packs would be an exercise in frustration and futility but I would like to be proven wrong.

Mark


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