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Direct connection from Lithium Ion 7.2V to receiver & servos

Direct connection from Lithium Ion 7.2V to receiver & servos

Old 03-13-2008, 11:31 PM
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Originally Posted by Motorman View Post
yes Roleof is right.
The regulator will protect a spectrum reciever because it is upstream in the reciever but the servos use +-power in pass through on the board and only the signal comes from the reciever. Don't use a regulator and you will smoke servo's. Been there done that! You will cook them on straight 2 cell lipo without a regulator maybe not immediatly but within a month it will happen.

I cooked 3 KO's this way and it was on a road trip race. A weekend trip across the U.S. became a total bust

Okey, I think I'm going to stop over voltaging my radio equipments.

I want to get these :

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Old 03-14-2008, 01:22 AM
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Have to aggree with teh guys.
The Spektrum reciever has a built in 8v regulater if not mistaken but the hassle is the power that goes to the servos.
I killed a Futaba and KO digital like this and especially after charging the lipo battery.
After using teh VXR regulater all is good and its got the low voltage cutoff.
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Old 03-14-2008, 03:31 AM
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Originally Posted by razzor View Post
Have to aggree with teh guys.
The Spektrum reciever has a built in 8v regulater if not mistaken but the hassle is the power that goes to the servos.
I killed a Futaba and KO digital like this and especially after charging the lipo battery.
After using teh VXR regulater all is good and its got the low voltage cutoff.
..... I wish my radio equipments can stand the torture of high volts
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Old 03-14-2008, 03:48 AM
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Originally Posted by Winner's Circle View Post
LIPO batteries should not be over discharged. If you do not have a low voltage cut off somewhere in the battery circuit you may over discharge your batteries. They will not recharge if over charged and I have heard one person say that they had a pack catch fire when trying to charge a pack that had been over discharged.

I use the NOVAK 5460 with my lipo packs.
I think we tend to think of lipo batteries like we think of Nicad batteries but could be an expensive mistake. I did some searching for "lipo low voltage" and found a site dedicated to RC electric aircraft where they talk about the danger of lipo batteries exploding due to low voltage. It is critical that some sort of a low voltage cut-off be run. Xceed and Novak both make them and stock them.

Lipo packs are light, small and powerful but they can blow up or catch on fire if they are not properly charged and used.

See
http://www.wattflyer.com/forums/showthread.php?t=10596
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Old 03-14-2008, 04:23 AM
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Originally Posted by Winner's Circle View Post
..........they talk about the danger of lipo batteries exploding due to low voltage. It is critical that some sort of a low voltage cut-off be run. Xceed and Novak both make them and stock them.

Lipo packs are light, small and powerful but they can blow up or catch on fire if they are not properly charged and used.

See
http://www.wattflyer.com/forums/showthread.php?t=10596
I think the battery was explode because one or more of the following factors have been breached :

1. the cell was ever depleted below 3V, and they recharge it again like normal

2. the cell was ever mistakenly charge or discharge OVER the spec.

3. the charger equipments are not up to the job ( cheap chargers usually not sensitive enough to see the peak )

4. the cells were first generation of lipo manufacturing technology. They could be safe to use but not that reliable.
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Old 03-14-2008, 05:10 AM
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If you check the specs on the servo your using I think you will see it's rated for 7.2 volts . I thought about using them without a regulator myself. I think you will be ok.
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Old 03-14-2008, 06:38 AM
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Lipo batteries are over 8v when fully charged.
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Old 03-14-2008, 07:45 AM
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Yes and ni-mh is over 7 volts when charged!
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