dteiger

Question for the electrical engineer out there. I have been flying a T-REX with the Thunder Power 2000 11.1v battery from my deceased Shogun. A painful death but that is a different story. My flights have decreased from 15 minutes to about 9 minutes. I am thinking of getting the Thunder Power 2100 for the TREX. Is there any advantage for time and power to getting the 4 cell 14.8 volts instead of the 3 cell 11.1 volt battery. The cost difference is minor. Can the TREX handle the 14.8 volt battery. Thanks for your help.

hitman13429

My Feedback: (1)

4 cell would give u about 3 more volts of power... if you are looking for runtime go up to more MAH whichs is really how much a battery can hold. The more mah the longer flying time u will have. As for can it handle a 3 cell.. it depends on the esc not the heli its self

dteiger

dj - what is you opinion of getting the 4 cell or 3 cell. The esc is align BL35G good up to 16.8 volts. Power vs weight

sp1nm0nkey

The Align ESC won't have a problem with the pack itself, it'll have problems regulating it for the servos. So if you want to run a 4 cell setup, you need a separate BEC (Ubec, ParkBEC) or an ESC with an internal switching regulator like the Jazz.

What motor are you running? How many kV? What's your current headspeed? What pinion? The more powerful battery will drive the motor through the roof, most people use a 4 cell setup if they want to run at 3000 headspeed or above (very, very twitchy, and dangerous, but great for 3D).

credence

My Feedback: (2)

Not sure what the t-rex uses, but if you're going to be pumping 14 volts (under load that is, don't forget it'll be even higher fresh off the charger), I would strongly suggest putting thrust bearings into all the high stress areas in the rotorhead and tail. Especially the tail since it spins even faster than the rotorhead does. 14 volts is overkill unless you're really into hard 3D.

And, of course, more voltage will push all your electronical equipment harder, so thats something to consider too. And as sp1nm0nkey already said, you'll need an external BEC to use a high voltage pack like that.

I'd personally suggest sticking with 11.1, but that's just me.

Shortymet55

Kinda along with the question. Is it worth spending more to get a 4cell battery li-po charger, or is 1-3 enough. I plan at stopping with a t-rex. What used 4 cells?

dteiger

Thanks for all th input. I am returning the 14.8 and going with the sure thing of 11.1.

jestertoo

Check out this link:

http://www.trextuning.com/hv.htm

dteiger

Thanks, that link was a great help, but I still think I will stay with 11.1 for the near future. What battery times are getting on the 11.1 tp 2100?