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Help me choose a new Battery for the Phoenix

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Expert ( offline )
Posts: 447
Posted: 2011-04-12 23:08 


Hey everyone I built this pack about 2 years ago, and when I'm getting back into the jist of things the thing wont hold a charge anymore, I'm guessing its shot.

I'm looking to upgrade to a Lipo something with a decent amount of current as I would like long run times. I have a 12volt charger running off a computer power supply and it does lipo charging so I'm set there.
so I'm looking for a 5000Mah + pack that will fit within the phoenix body. I know I need one of those Ubec turnigy lipo controllers.

You guy's are the experts what do you recommend?

Thanks,
--Aaron

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Posts: 205
Posted: 2011-04-13 11:22 
Look into the " Lipo Wars " thread on this forum.

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Posts: 2120
Posted: 2011-04-13 11:30 
Hi,

I believe Xan use version 1 of these LiPo's.
The 4000 mAh LiPo's I'm using for Phoenix are discontinued. As long as you find a LiPo that will fit inside the body it should be fine. It might be hard to get enough space for a 5000+ LiPo.

To be honest I'm considering to start using much smaller LiPo packs for my future projects (like 2000 - 3500 mAh or so), simply because I don't need the very long runtime.

Anyway, what I like with using LiPo's is that you can power both the electronics and servos (using a regulator of course) from the same battery. So no need for an extra 9v battery for logic.

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Expert ( offline )
Posts: 447
Posted: 2011-04-13 13:33 
Putt Putt, Zenta,
Thanks,

I'll look on that website and find something to buy and post it here before I do to make sure its the right one. I know I drilled new holes in the phoenix and moved the 6 internal supports for spacing the bottom and top deck so I could fit my battery between there.

So what's the deal with the packs that aren't 7.0 volts? Is the Turnigy device similar to a linear voltage regulator? Hopefully without the heat dropping those voltages.

It's really about finding a battery that just fits within the phoenix body and has the capacity you require right?

Off topic, putt putt your little icon for your user name looks so familiar, that was a coin bank right? I had one of those things ages ago!

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Posted: 2011-04-13 14:59 
LikWidChz wrote:
So what's the deal with the packs that aren't 7.0 volts? Is the Turnigy device similar to a linear voltage regulator? Hopefully without the heat dropping those voltages.

2S 7,4v LiPo's are the one you should go for.
The Turnigy regulator I'm using is a switch regulator, not a linear.

LikWidChz wrote:
It's really about finding a battery that just fits within the phoenix body and has the capacity you require right?

Yep.

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Kåre Halvorsen, Zenta
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Zenta's YouTube channel
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Posts: 205
Posted: 2011-04-13 15:45 
LikWidChz wrote:

Off topic, putt putt your little icon for your user name looks so familiar, that was a coin bank right? I had one of those things ages ago!


Yes, he's called " ROBIE the BANKER " from the 80's , was sold at Radio Shack. I have a collection of various toy robots, some are just amazing at what they can do and others are great conversation pieces.

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Expert ( offline )
Posts: 447
Posted: 2011-04-14 14:40 
Zenta what does the 2S mean in regards to lipo?

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Posted: 2011-04-14 14:53 
S stands for series. It means 2 cells in series. One cell is 3.7vdc, so a 2S would be 7.4vdc.

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Expert ( offline )
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Posted: 2011-04-14 19:01 
Thanks!

Hah... Nice icon Jim,

Do you actually have one of those Bioloid guys pushing around beer?

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Posted: 2011-04-15 09:47 
Bioloid!!! :twisted: Baaa!!!


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Expert ( offline )
Posts: 447
Posted: 2011-04-26 20:57 
Alright Zenta,

How about these "I'm looking for more capacity then less here" but they all seem to be around 5000mah and the prices are a couple bucks here and there.
http://www.hobbyking.com/hobbyking/stor ... duct=14995 ?
http://www.hobbyking.com/hobbyking/stor ... duct=14976 <--- this will fit a bit better and it has a 4C charge rate, the others are 2, so I'm guessing this will charge 2x as fast as the others?
http://www.hobbyking.com/hobbyking/stor ... duct=16766
http://www.hobbyking.com/hobbyking/stor ... oduct=9437

These batteries fell in the category of 2S and between 20C and 30C on hobby kings search thingy.

I modified the risers that seperate the top and bottom plate of the phoenix so they are slightly farther away from each other then the stock ones.
The clearances I have between the top and bottom plate is 23.41mm
The available width I have is 52.40mm
then the length I have available is 150mm... which is basically the entire length of the robot... so wires will be sticking out

I think I better consult the experts.. since I'm just driving servos can I get away with a 20C discharge or even a 10?

Forgive me if this question is a bit stupid, I have never bought a lipo before.
And then I would need one of these http://www.hobbyking.com/hobbyking/stor ... oduct=6233 the Turnigy Ubec 15A regulator.

Thanks,
--Aaron

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Posted: 2011-04-27 16:02 
LikWidChz wrote:
http://www.hobbyking.com/hobbyking/stor ... duct=14976 <--- this will fit a bit better and it has a 4C charge rate, the others are 2, so I'm guessing this will charge 2x as fast as the others?
-snip-
I modified the risers that seperate the top and bottom plate of the phoenix so they are slightly farther away from each other then the stock ones.
The clearances I have between the top and bottom plate is 23.41mm
The available width I have is 52.40mm
then the length I have available is 150mm... which is basically the entire length of the robot... so wires will be sticking out

I think I better consult the experts.. since I'm just driving servos can I get away with a 20C discharge or even a 10?

Forgive me if this question is a bit stupid, I have never bought a lipo before.
And then I would need one of these http://www.hobbyking.com/hobbyking/stor ... oduct=6233 the Turnigy Ubec 15A regulator.

Hi,

I've bought something that appear to be the same battery (same product id) but from the International Warehouse http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10098. Looking at the latest comment this seem to be another product. I've not tested mine yet. And they are rated 2C charge, not 4. I'm just hoping its not just a piece of crap. You normally get what you pay for.

Anyway, most of the LiPo's are 1C for charging. So 2C is very good too. Also, you need a pretty beefy charger to do 4C on a 5000mAh battery.

What I like with the hardcase is that the wires don't stick out but upward from the case.

I guess you just have to test them to see if they perform ok. A balance charger is always recommended.

Yes, 10C (=50 Amps) is more than enough for robotics.

The regulator is needed for powering the HS-645's, not a stupid Q at all.

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Kåre Halvorsen, Zenta
-----------------------------------------
Zenta's blog
http://zentasrobots.com/
Zenta's YouTube channel
http://www.youtube.com/ZentaOlbaid
-----------------------------------------


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Guru ( offline )
Posts: 9258
Posted: 2011-04-27 16:19 
zenta wrote:
Yes, 10C (=50 Amps) is more than enough for robotics.


If I remember correctly the Phoenix draws around 8 amps when walking. At 5000mAh a 2C discharge would work well. lol

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Expert ( offline )
Posts: 447
Posted: 2011-04-27 17:17 
Zenta, Jim,


Thanks for the responses, I'll go ahead and order this when I get home from work.

I have this 12volt charger that does a bunch of different battery styles. Its max rate of charge is 5amps so I guess this means I'll be able to charge these things at 4C so if these are 5000mah is that roughly 1 hour and 1/5th of an hour for total charge time?

I have noticed these batteries have some extra wires coming off them like little bits 3-4 wires or so, is this something to do with the voltage monitoring? and if so does it plug into these Ubec devices or are they left disconnected?



Last thing I want is smoke escaping!

--Aaron

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Guru ( offline )
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Posted: 2011-04-27 17:27 
A 5000mAh pack charged at 5 amps is charging at 1C. Charging at 4C would be charging at 20 amps. Charging at 5 amps will take roughly 1 hour. Charging at 4C would take 15 minutes.

The smaller cable is for charging using a charger that charges each cell individually ensuring a full charge. I think most people charge their Lipos with this balance charging plug.

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