RCU Forums - View Single Post - Need a E-Heli suggestion for my A123cells
Old 09-26-2008, 02:02 PM
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kd5boc
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Default RE: Need a E-Heli suggestion for my A123cells

You can use them in a 4s configuration on a trex 450 w/ scorpion ESC (as long as you have a separate BEC.)

The thing about the ESCs...
Most of them "can" allow a 4s configuration, however, they have a built-in BEC which WILL be blown out by that amount of voltage (14.4v). If you're going to fly a 4s A123 on a normal mini heli, make sure to get a separate BEC that can handle an input of 14.4volts.

For example, the Castle Creations Phoenix-45 ESC http://www.castlecreations.com/products/phoenix-45.html has a normal input up to 12.6v using the built in BEC, and up to 19.2v without using it (ie, removing the red wire from the servo lead and using a separate BEC.) Theoretically, you could use a 5s A123 pack on this ESC...but you'd still need a separate BEC with an input of that kind of voltage 18V (like this one. http://www.castlecreations.com/products/cc_bec.html that can handle up to 25v and has outputs from 4.8v to 9v)

As far as a forum, there really isn't a specific one as they are just batteries. I know folks with a normal 11.1v trex 450, and another with the 4s arrangement of A123. It's just another option for power.

I'm about to grab that Castle Creations Phoenix 45 and run a 4s arrangement on my Blackhawk 500 using the CC_BEC and scorpion motor. Just trying to find the right one. lol