|Dec 09, 2012, 07:40 AM|
Joined Aug 2003
UltraMicro battery life - When do you declare them dead?
I've been flying my Eflite UM, and Blade micro heli's for a year or so now. (I think...) And I've been enjoying them immensely.
I've noticed my flight times dropping. So I decided to break out my nice charger, and test the batteries to see what they're really giving me.
Before anyone jumps at me, I didn't do this "right." I don't have time to gently cycle each cell properly. But what I've done should give a really good idea of what's going on.
Here's how I did it. I used my 6 way adapter, and discharged all of my batteries down to 3v at less than 1c per cell.
I then have been charging all of my cells at 200ma. Since there are losses while charging, my charge numbers will be "generous."
Here are my results:
No Brand Label Test C Heli/Plane 1 Eflite 150ma 154ma 12c Plane 2 Venom 120ma 94ma 25c Heli 3 Eflite 150ma 83ma 12c Heli 4 Eflite 150ma 134ma 12c Plane 5 Eflite 120ma 108ma 14c Plane 6 Eflite 120ma 79ma 14c Heli 7 Eflite 120ma 103ma 14c Plane 8 Eflite 120ma 100ma 14c Plane 9 Eflite 120ma 72ma 14c Heli 10 Eflite 120ma 106ma 14c Plane 11 Eflite 120ma 94ma 14c Heli 12 Turnigy 160ma 145ma 40c Heli 13 Turnigy 160ma 145ma 40c Plane 14 Eflite(25c) 150ma 153ma 25c Heli 15 Turnigy 160ma 130ma 40c Heli 16 Turnigy 160ma 136ma 40c Plane 17 Turnigy 160ma 40c Plane 18 ParkZone 70ma 19 ParkZone 70ma 20 Eflite(25c) 150ma 25c 21 Eflite(25c) 150ma 25c
To cut to the chase, at what capacity do you declare a battery dead? The industry at large considers 50%. I'm thinking about this, and as the batteries lose capacity, i'm effectively running them at higher C ratings. That can't be good.
|Dec 09, 2012, 09:24 AM|
Joined Aug 2003
Hmm. Took 4 cells with me to the field this morning. I found batteries 1 and 4 couldn't sustain full throttle for more than 5 seconds before things started flashing.
Those are getting retired. 13 and 16 were just fine, and could go minutes.
I wonder if I'll have more than 5 good batteries at the end of my testing. :-) At least I'll have cells where I can be confident in flight time.
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