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Old 02-02-2009, 08:22 AM   #1
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Default 11.1v help

How do I know if my esc can handle a 11.1v pack vs. a 7.4?? I am looking into a tekin fx-r. I have an lrp a1 I think in it now with no lipo shut off.
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Old 02-02-2009, 08:29 AM   #2
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http://www.teamtekin.com/manuals/FXManual.pdf
Look in the Specifications section.
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Old 02-02-2009, 08:33 AM   #3
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The Tekin FX-R will accomodate a 3S (11.1v) Lipo if you are running a single 35 turn motor or higher. Anything lower than 35T, or dual servos like a dig set up or rear steer, then you'll need to run a BEC as well.
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Old 02-02-2009, 08:45 AM   #4
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Your current ESC, the LRP AI can't handle a 3s lipo. You could run a 2s 7.4v lipo, but I don't know if it has a lipo cutoff built-in.

I highly recommend the Tekin FX-R
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Old 02-02-2009, 09:13 AM   #5
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Not trying to sound totally stupid but is it as simple as 2 cell is 7.4 and 3 cell is 11.1? If so, I apologize for my stupidity. lol
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Old 02-02-2009, 09:25 AM   #6
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Quote:
Originally Posted by jreckner View Post
Not trying to sound totally stupid but is it as simple as 2 cell is 7.4 and 3 cell is 11.1? If so, I apologize for my stupidity. lol

correct..if your esc can handle a 7.2v nimh or nicad then it can handle a 7.4v but no more then that..and be careful and make sure that either the esc or the battery has an lvc (low voltage cutoff)
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Old 02-02-2009, 09:42 AM   #7
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It doesnt have lv cutoff but I am using an external one from common sense. I have yet to run one all the way down to cut off for fear of it not working but it is supposed to work.
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Old 02-02-2009, 09:44 AM   #8
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Quote:
Originally Posted by jreckner View Post
Not trying to sound totally stupid but is it as simple as 2 cell is 7.4 and 3 cell is 11.1? If so, I apologize for my stupidity. lol

your correct, each cell is 3.7v
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Old 02-02-2009, 09:54 AM   #9
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Quote:
Originally Posted by jreckner View Post
Not trying to sound totally stupid but is it as simple as 2 cell is 7.4 and 3 cell is 11.1? If so, I apologize for my stupidity. lol
it's not a dumb question at all.
in the general sense, you have it right as each lipo "cell" is rated at 3.7v. (thus: 1S - 3.7v, 2S - 7.4v, 3S - 11.1V, etc). however there is a "but"....

you can also wire cells in a parallel formation for longer run times.

for example, you might find a 2S2P battery... which means 4 cells have been combined to get you 7.4 volts.

i just think of it this way:
Parallel - add up the cell MaH.
Serial - add up the cell V

here's a site that may explain better than i can at 9am... http://www.glypo.com/guides/lipo/
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Old 02-02-2009, 11:54 AM   #10
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Thank you guys. I really appreciate all the info.

J
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