Duralite Li-Ion Batteries

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I've installed Duralite 4000mAh batteries on both my helis:

 

 

Fury Extreme

Duralite 4000 mAh Flat, 4 Cell, 7.4V RX pack

Regulator with switch, 7.5A, 5.1V

 

 

Thunder Tiger Raptor 50 V2.0

Duralite 4000 mAh Flat, 4 Cell, 7.4V RX pack

Regulator with switch, 7.5A, 5.1V

 

 

 

Miscellaneous

Charger 7.4V RX output with DC Cable

Power supply for charger 12V, 1000mA (already had this)

Load tester with digital readout

 

 

The Duralites should keep me flying much longer than my previous JR 1900mAh batteries; on the Fury I could get 3 flights, the 4th was a risk!  With the Duralite in the Fury I can get at least 6 flights.

 

Stop fly voltage for the Duralites is 6.9V, so I'm keeping a log of the voltages (all under 1A load) after each flight:

 

Fury Extreme 90:

 

Flight 

Start 1 2 3 4 5 6 7 8 9 10

13/07/04

7.60 7.45 7.35 7.25 7.15 7.07          
18/07/04 7.63 7.46 7.34 7.22 7.14            
21/08/04 7.57 7.42 7.30 7.17              
29/08/04 7.59 7.42 7.31 7.24              
04/09/04 7.55 7.42 7.34 7.22 7.15            
05/09/04 7.57 7.46 7.36 7.29 7.19 7.00 6.95        
25/09/04 7.35 7.28 7.20 7.14              
26/09/04 7.44 7.40 7.32 7.28              
22/08/06 7.31   7.19                
                       
                       
                       


 

Raptor 50:

 

Flight 

Start 1 2 3 4 5 6 7 8 9 10

01/08/04

7.60 7.50 7.47 7.41 7.34 7.27          
15/08/04 (after discharge from tree crash) 7.55 7.44 7.40 7.37              
22/08/04 7.51 7.50 7.44 7.36              
                       
                       
                       
                       
                       
                       

 

 

Some useful info on Li-Ion Batteries here: Lithium Ion Batteries


I received this informative email from David Harkey:

 

"You should be able to get at least 10 flights with you setup between charges. You can use the batteries till they are 6.9 volts with a 1 amp load.

I have actually flown 14 full tank flights with the Duralite 4000 mah pack. My setup is 3 X 9252's, GY 601/ 9251, 9250 on throttle. The cutoff voltage is set high at 6.9 volts. I have flown the batteries down to 6.5 volts with 1 amp load. I have been using the Duralites about 18 months now and never had a problem. The battery is just getting into the meat of the capacity when it is at 7.1 to 7.3 volts. Like I said 6.9 volts at 1 amp is a high safety area. These batteries can go in the mid 6 volt range with no problems.

The Duralite support forum is located at

helifreak.com

Any questions can be answered there by all the Duralite users.

David"