Jetcat ecu battery 3 cell LiFepo
08-04-2015, 07:27 PM
#1
Jetcat ecu battery 3 cell LiFepo
Need some help with these batteries.
When I charge on cellpro I have a gp/ko board that fits the balancer 3s. I set to a123 2100 and start to charge.
The initial read is 43% and then in a matter of minutes it is 92 right up to 99/100% at 10.9/11 volts.
When I check it with one amp it drops to 9.6/9.8. Resting no load 10.2.
Is this normal?
Thanks,
Dave
When I charge on cellpro I have a gp/ko board that fits the balancer 3s. I set to a123 2100 and start to charge.
The initial read is 43% and then in a matter of minutes it is 92 right up to 99/100% at 10.9/11 volts.
When I check it with one amp it drops to 9.6/9.8. Resting no load 10.2.
Is this normal?
Thanks,
Dave
08-05-2015, 01:33 AM
#5
Li-fe pack like JetCat use will do that, you cannot judge charge state on voltage, I use a Graupner charger, and it reaches high voltages quite quickly, but continues to charge for a good time. You don't seem to be able to push the charge current either, I charge 1c and any top up charge is below that (1A)
They are nothing like A123 which take a hammering
They are nothing like A123 which take a hammering
08-05-2015, 01:36 AM
#6
08-05-2015, 04:27 PM
#8
My Feedback: (57)
Needless to say, that's the last time I used that as my measure of go/no go; and I've never had a battery related issue since.
08-06-2015, 06:02 AM
#9
Dave,
I picked up one of these a few years ago, and love it.... simple quick solution to double check if there's any doubt. I keep it my transmitter case to have on the flight line in-case I question if I got a particular battery charged or not at the last minute.
http://www.electrodynam.com/store/EDR-207.html
With this adapter to handle the 3 cells:
http://www.electrodynam.com/store/EDN-XH-CP.shtml
That's assuming they are Andy's A123, and have his normal balance leads.
There is even a sticker on it as a reminder that if it's below 3.3 volts on any cell, it's a no-go. 3.3 or higher, go fly.
Oh, and by the way, as said above, the percentage on that charger is near useless. I use it all the time, and I know the pack it only around 30% drained, and it thinks it only has 20% left, when I start charging. Notice the actual Milliamps that is being put back in it, as a real yardstick of how down it was.
Lance
I picked up one of these a few years ago, and love it.... simple quick solution to double check if there's any doubt. I keep it my transmitter case to have on the flight line in-case I question if I got a particular battery charged or not at the last minute.
http://www.electrodynam.com/store/EDR-207.html
With this adapter to handle the 3 cells:
http://www.electrodynam.com/store/EDN-XH-CP.shtml
That's assuming they are Andy's A123, and have his normal balance leads.
There is even a sticker on it as a reminder that if it's below 3.3 volts on any cell, it's a no-go. 3.3 or higher, go fly.
Oh, and by the way, as said above, the percentage on that charger is near useless. I use it all the time, and I know the pack it only around 30% drained, and it thinks it only has 20% left, when I start charging. Notice the actual Milliamps that is being put back in it, as a real yardstick of how down it was.
Lance
Last edited by Lance Campbell; 08-06-2015 at 06:06 AM.
08-06-2015, 09:52 AM
#10
Don't fall into that trap, Dave, I thought exactly that then was faced with a flamed out landing with a Hawk at CJ a couple of years ago !
It, the JetCat 180 RX, started fine on its Jetcat Life pack, but didn't last.
Thats what my big jets now have dual ecu batteries with an Emcotec units to share power !
David.
