|05-27-2007, 11:39 AM||#1|
I am: ber
Join Date: Feb 2007
Feedback: 15 / 100%
Total Props: 1
when to stop flying- re: lipo battery
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hi... sorry for newb ???
when there is no more lift??
or time'd minutes? for 11.1v 2100mah 15c battery??
is it safe to charge battery after flying, while it is warm?
i bought this combo...
after using these battery..use default charging..some cell's say battery repair..
|05-27-2007, 12:26 PM||#2|
RCC Master Contributor
I am: Rob
Join Date: Nov 2003
Location: Owen Sound
Feedback: 11 / 100%
Total Props: 0
It really dependes on what you are Drawing out of the batteries. With a lipo batterie the idea MAH drawn out of the battery would be 80% of its max MAH so in your case on a 2100 Mah when you charge the battery you should be putting in 1700 mah . Compleaty dischargeing the battery to low voltage cut off will shorting the life span of your battery. Do not charge the battery while it is warm this will also hurt the life span. Let the battery cool down to ambent Temp before rechargeing. I time my flights with my T-rex and I fly for 6 solid mins doing sport areobatics. I notice a drop in power and thats when i land. Hope this helps . Rob
What do you mean , I can land upside down
|05-28-2007, 03:58 AM||#4|
RCC Master Contributor
I am: Calvin Martini
Join Date: Jan 2005
Location: Riverview, NB, Canada
Radio of choice:
# of RCs: 5
Feedback: 8 / 100%
Total Props: 7
Just to add to the discussion, pack temperatures over 60 Celcius will destroy lipos and temperatures of ~55 Celcius will shorten their life considerably.
The better quality newer lipos wil hold their voltage right up to the end, so relying on the headspeed dropping will mean the heli dropping. We're talking 3-4 seconds before it falls out of the air.
On a heli, you can adjust the load put on the power system through the pinion selection, headspeed (throttle curve), blade size and type, gear mesh, and by changing motor or battery.
So, to help you ensure that you have a well matched power system for your setup and to ensure that you are treating your lipos well, you should invest in a wattmeter and a temperature gauge. Use the wattmeter to see how your power system is behaving and the temperature gauge to measure the finish battery and motor temperatures (you don't want the motor too hot either).
If you take the time to optimize the power system and setup, you will be rewarded with many cycles on your lipos. If not, you may destroy the packs quickly (they will puff).
New developments in battery technology are giving us more breathing room, but you still need to set everything up well.
For reference, on my Trex 450SE with a 500TH motor on 14T with TP 2070 Extreme packs (25C) running 2800 RPM, I get just 5 minutes of flight.
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