RE: E-SKY LAMA 2 THREAD  
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RE: E-SKY LAMA 2 THREAD - 1/19/2006 5:18:14 PM   
Kamikazi


 

Posts: 193
Joined: 11/4/2003
From: Osceola Mills, PA, USA
Status: offline
quote:

ORIGINAL: lseguy


quote:

ORIGINAL: Freakazoid

http://www.aero-nuts.com/product_info.php?products_id=336
They deliver quick and properly. Excellent shop. I see they even dropped the price since last I checked. Theire now only 11 dollars!
And mind you, these are EXACT drop-in size for the lama. Theire completly the same size. Only flaw might be is that you cant charge them with the origional lama charger (nor pertymuch any other lipo of this size, so dont go blaming ELE. )

The electronics in my lama are as follows:
GWS PG-03 gyro.
Feda Helicopter ESC/Mixer board (Meant for micro helicopter with a separate tail motor)
GWS 4ch. Micro reciever.

All I did was strip the whole bunch and stick em together in a neat little package. For further info, look at the pics.



General question:
How do you balance charge these batteries, when they dont have a balance charge lead/connector?

Im new to this, and I just recall the LHS owner stating to use the charger that came with the Lama for the stock Lama batts, because balance charging is important?



You can't balance charge those packs unless you tear them apart and install your own balancing taps.
The Esky charger won't work on them either. I'd never buy a Lipo now without a balancing connector - lots of packs have them, so there is no reason to buy a pack without 'em.
Out of balance Lipos packs is probably one the greatest fire risks - right up there with improperly set chargers.


(in reply to lseguy)
       Post #: 351

RE: E-SKY LAMA 2 THREAD - 1/19/2006 5:26:20 PM   
lseguy


 

Posts: 207
Joined: 12/25/2005
From: Laurel, MD, USA
Status: offline 		Ahh. So that's why those packs are so cheap...don't allow balance charging.

Understood. Tradeoff I guess....but one I will pass on.

Thanks.

(in reply to Kamikazi)
       Post #: 352

RE: E-SKY LAMA 2 THREAD - 1/19/2006 5:39:34 PM   
GTX SlotCar



Posts: 2067
Joined: 10/7/2005
From: Gorham, ME, USA
Status: offline 		You can get an adapter cable from balance to JST end and it will work, but I also like balance charging and I use it on all my batteries.
I'm not even sure how you wire a balance connector in the battery, but if anyone does, I'd like to know. I think on a 2 cell, it's pos. to pos. , neg. to neg. and neg. to neg., but I'm not sure.

_____________________________

Gary
SuperSkids® www.super-skids.com

(in reply to lseguy)
       Post #: 353

RE: E-SKY LAMA 2 THREAD - 1/19/2006 6:19:24 PM   
Kamikazi


 

Posts: 193
Joined: 11/4/2003
From: Osceola Mills, PA, USA
Status: offline 		Balance taps are simply a connection to each individual cell. For a two cell pack, you need three wires... for three cells, four wires, etc.
If you have a two cell pack and only two wires, you don't have access to both cells individually.

The problem occurs when one cell is slightly weaker. It will discharge to a lower voltage, and will therefore lag behind the other cell when charging in series with the stronger one. Eventually the charge termination voltage gets so much higher on the stronger cell that it puffs and possibly vents with flames

The more closely matched the cells are, the longer you can get away without re-balancing them.
Charging each cell separately keeps their state of charge almost identical, so one cell doesn't get overcharged.

(in reply to GTX SlotCar)
       Post #: 354

RE: E-SKY LAMA 2 THREAD - 1/19/2006 7:11:10 PM   
GTX SlotCar



Posts: 2067
Joined: 10/7/2005
From: Gorham, ME, USA
Status: offline 		The confusing part of the wiring is that the + of one cell is internally connected to the - of the other to put them in series. The balance connector doesn't cut the connection, so how does it charge each cell individually? I know the connector has one + and then a - for each cell. I just don't get the internal wiring.

_____________________________

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SuperSkids® www.super-skids.com

(in reply to Kamikazi)
       Post #: 355

RE: E-SKY LAMA 2 THREAD - 1/19/2006 8:25:56 PM   
thecheatscalc



Posts: 1228
Joined: 8/13/2005
From: fayetteville, GA, USA
Status: offline 		*sigh* well, I have a nicely swollen battery (my dad's heli) mine, as far as I know, is fine, but, his has only gone though three cycles.




I'm sure it's probably the charger, but, for just three cycles, there MUST be something wrong! Luckily I fly up close to my head, and, what do you know, the battery tray was swollen! after setting it down, I saw that one of the battery packs had swelled, but the other had not. it's really weird actually.... I should probably use my charger from now on just to be safe. I also hope to take it apart and spare the good cell, the other one I'm going to destroy, but I must say, I'm amazed how these things swell!

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All stock located in the U-S of A!

(in reply to GTX SlotCar)
       Post #: 356

RE: E-SKY LAMA 2 THREAD - 1/19/2006 11:11:00 PM   
Kamikazi


 

Posts: 193
Joined: 11/4/2003
From: Osceola Mills, PA, USA
Status: offline
quote:

ORIGINAL: GTX SlotCar

The confusing part of the wiring is that the + of one cell is internally connected to the - of the other to put them in series. The balance connector doesn't cut the connection, so how does it charge each cell individually? I know the connector has one + and then a - for each cell. I just don't get the internal wiring.



The balance connector has a wire going to the + and - of every cell - but the wires between cells are shared. Forget that the cells are wired in series for now. To charge (or measure) the voltage of any one cell, just connect to the two wires going to any particular cell. On a two cell pack, the center wire is shared. On a three cell, there are two shared wires. A balance charger doesn't apply voltage to a pair of wires that has more than one cell between them however... if it did, it would no longer be connected to an isolated cell.

The charger basically has multiple isolated charging outputs for each cell. The fact that each cell shares ONE common wire with the cell next to it makes no difference... Every cell can still be isolated from the others. The part that may be confusing is that a common wire serves as both a + and a - connection. The voltages across all the cells in the pack are relative. The shared wires can't be called a + or a - polarity.


(in reply to GTX SlotCar)
       Post #: 357

RE: E-SKY LAMA 2 THREAD - 1/20/2006 5:02:48 AM   
BadBoy__MadMikey


 

Posts: 303
Joined: 10/1/2004
From: Spartanburg, SC, USA
Status: offline 		i finally found out why my lama was loosing power in ahover and spinnng to one side. the battery was loosing power bad!!! i tried flying with an apogee 830 mah 2 cell and i flew over 10 minutes easy!!! i uses wire ties and strapped it to the bottome of the heli. i've tried cycling the pack several times with no success, it still won't let me hovver over 3 minutes without falling out of hover and no matter how much throttle!!! but i got several packs coming from balsa products. if anyone wants extra packs got to balsa products they have them in stock right now.
an issue i had with mine was i took all of the farward trim and then some!!! after talking with our clubs heli pro, he told me to stick a quarter to the frount of the canopy with double sided tape. it works!!!! my trim is almost back at center!!! if any of you guys have alot of farward or back trim try put a little weight on the side that needs it!!!

mike

(in reply to Kamikazi)
       Post #: 358

RE: E-SKY LAMA 2 THREAD - 1/20/2006 6:09:01 AM   
GTX SlotCar



Posts: 2067
Joined: 10/7/2005
From: Gorham, ME, USA
Status: offline
quote:

ORIGINAL: Kamikazi
..... Forget that the cells are wired in series for now. ... The part that may be confusing is that a common wire serves as both a + and a - connection. ...


That was the confusing part. So, it connects just the way I thought it did, and it works. Now if I can find a couple connectors somewhere, I can wire up a couple new batteries.

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_____________________________

Gary
SuperSkids® www.super-skids.com

(in reply to Kamikazi)
       Post #: 359

RE: E-SKY LAMA 2 THREAD - 1/20/2006 11:28:37 AM   
Norrmannen


 

Posts: 217
Joined: 3/26/2004
From: Akershus, NORWAY
Status: offline 		Well that is usually what happens when it is discharged at a too high rate, the swelling, which is an irreversible chemical reaction in the battery. Just deliver it where they take used batteries, it's gone. It's not the charging that killed it.

If you fly these packs to low on voltage you damage them and they loose capacity, as they loose capacity you will be pushing them harder and harder untill they are gone. If one does like it was usual with nimhs and fly till it won't lift off then you can damage the batteries in only a couple of flights. I had one puff and burst for me on first flight.

(in reply to thecheatscalc)
       Post #: 360

RE: E-SKY LAMA 2 THREAD - 1/20/2006 12:15:28 PM   
BadBoy__MadMikey


 

Posts: 303
Joined: 10/1/2004
From: Spartanburg, SC, USA
Status: offline 		the werd thing about my pak is it will take a charge from my chargers and the e-sky charger and i checked the voltage on both cells and they are not unbalanced or anything but after about 2 or 3 minutes the battery just won't hold up anymore. i only got about 6 flights on the battery before it tarted doing this. i thought at first it was one of the motors going but once i tried one of my other 2 cell paks it does great. i've used li-po packs for over 2 years now and i understand what your saing about over discharging. i have the e-sky honeybee cp 2 also and it has no voltage cut-off too. i really think it's something they should look into puting on them, cause some flights you might pull just a bit more than the last and boom, there goes your pack. i bought an digital cooking time and set it for about 12 minutes and fly by that!!! but everyone needs to remember that if you are just hovering all flight you are really sucking on your battery, were flying around uses less power!!
in the past week i have been doing farward flight with my honey bee cp1 and my lama helped me out of getting started on farward flight alot!!! i'm looking to be getting a t-rex xl or a freind is tring to get me to get a all aluminim heli called a qj8 3-d heli by quick helis. onward and upward!!!

mike

(in reply to Norrmannen)
       Post #: 361

RE: E-SKY LAMA 2 THREAD - 1/21/2006 4:04:34 PM   
amitysanimal



Posts: 605
Joined: 7/18/2003
From: Veazie, ME, USA
Status: offline 		I just got my Lama 2 today. Is it suppose to have a manual with it? Mine doesn't have one.

_____________________________

amitysanimal

"Everyone needs something to beleive in.....I beleive I need another rc"

(in reply to BadBoy__MadMikey)
       Post #: 362

RE: E-SKY LAMA 2 THREAD - 1/21/2006 6:24:01 PM   
orlandomd


 

Posts: 25
Joined: 1/12/2006
From: montgomery village, MD, USA
Status: offline 		Guys, it finally happened. My 4 in 1 control burned this morning. I've seen threads about this. Does anybody know in what page it's located? I need to obviously replace it, but do I hav