3 cell lipo ~13v smoke a 1 hv?

[zaboomafuu]

any one have a 3 cell lipo running on the 1hv direct? I know the bioloid can handle it and it comes with a 9.6v batt the 1hv should hold it.... I havent seen manny electronic gizmos that cant handle a volt or 2 over. I just want some input. I heard about people taking out the rcb by hooking it up t a 12v power supply also tho they put out about 13.8v. I dont know I just dont want to fry my lil buddy.

[Ray]

Manoi PF also use same PCB in KHR2HV, It use three 3.7V Li Po batteries and so the total voltage is also 11.1V

I personal use a 11.1V to play my KHR1HV and KHR2HV for 1 year long and found no problem.

You may try 11.1V, however, at your risk, I cannot guarantee it is safe for your robot since I am not the manufacturer.

[zaboomafuu]

thanks Ray that is all I was really looking for was someone with some expriance with lipo batterys I work in a hobby shop so I mess with them all the time in stuff that was made to use them. and I know some of our stuff runs at 9.6v and we put 11.1v lipos in and there fine. so I figured that some thing made to run at 10.8 would be ok aswell. thanks again.

[zaboomafuu]

up date have been running my 1hv on 11.1v for a while now and he is a lil faster and a lil stronger knees do get hot faster but no damage done

[StuartL]

Do note that a fully charged LiPo puts out about 12.6v, not 11.1v. It may or may not make a difference but do be aware of it...

[Zacohk]

I am planning to use a 3 lipos 2200mah to power my KHR-2HV robot (1 pack in each leg and one in the body).
Does anybody have more experience with powering a RCB -3HV controller with Lipos?
Do you know any efficient voltage regulator that can handle the high current rate (2 to 4 A) and keep it stable/under 12 V (in particular when the batteries are frully charged)?

[Meltdown]

Zacohk,

I hope you are talking about splitting one 3 cell 11.1v 2200ma lipo battery into 3 individual cells of 3.7v right?
Then distributing them to different places on the robot, connecting them to form a 11.1v battery again, right?

If not then be warned!
If you don't have the 30kg/cm servos DON'T go there!
The standard KHR leg servos are weak as is.
It's barely enough to power the standard robot configuration.
If you going to use 3 lipo batteries 2200ma it will be much to heavy, your servos will burn out or your gears will strip due to weight.

I have experience with lipos and RCB-3HV controller.
Mine is using it for a year now without any problems
A 3 cell lipo 11.1v will be save to use without voltage regulator if you have the RCB3-HV.
No need for a voltage regulator.
The controller and servos can take more than 12v no problem.
The voltage will drop anyway to 11.1v when under load.

[Zacohk]

Yes, I was thinking of 3 x 3.7V lipo cells
You are right concerning the weight and I want the total battery weight to be under 100g.
You gave us a very nice mod explaining how to put the Lipo batteries in the feet:

http://robosavvy.com/forum/viewtopic.ph ... sc&start=0

I found a 3800mah 3.7V cell that weight only 33 g :

Single cell Lithium Polymer 3800mAh battery.
Dimensions: 127mm x 44mm x 6mm
Weight: 33 grams
http://www.all-battery.com/3_7volt-3800 ... Celll.aspx

The only convenient position for these long cells would be one along each leg and one on the robot back.

[billyzelsnack]

I find it hard to believe that that cell only weighs 33 grams. I think it is a misprint.

btw. A good place to find a good selection of inexpensive lipos is.. hobbycity.com .

[Meltdown]

Thanks for the compliment Zacohk
The reason i had to use a voltage regulator in that mod was that i had to go from 7.4v to 6v because i used the RCB1 6v KHR-1.
Things have changed since then.
Now i use the RCB3-HV with 11.1v lipos.

Yes must be a misprint
33 grams can't be right.
My 1600mHa 3.7v cell weights 40 grams already.
I think this 3800mHa is more like 133 grams.

[rodmanLT]

Hi all, I'm robotics enthusiast from Lithuania. I got my KHR-1HV just a couple of weeks ago. First thing I did was throwing away heavy and bulky NiMh battery and putting in place 3-cell lipo (820mAh cheap HiModel lipo). My 1HV feels just fine with this mod (at least no smoke for sure). Maybe tomorrow I will post picture or make youtube movie.

[rodmanLT]

here are promised pictures:
http://blog.elektronika.lt/robotai/humanoidas/

[Ray]

Japan shop starts selling Li-Po battery set (11.1V) for KHR2

http://www.technologia.co.jp/2_3472.html

[Thex1138]

Hey there Rodman.
On your blog you write that you had shorted out a servo by using 12 v instead of 10v
Do you know what caused it, was it using LiPo battery or just some other event?
Did you end up installing a regulator?

[rodmanLT]

I was trying to teach my robot to dance, and I forgot to make some pauses in between training lessons
So rotor windings of leg servo just burned.
But until now all other servos are ok without any regulator.