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Welcome to the FMA Direct / Lithium Power Solution Forum

Old 09-15-2004, 04:38 PM
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mvigod
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Default Welcome to the FMA Direct / Lithium Power Solution Forum

Welcome to the FMA Direct - Kokam LiPo battery support forum. Ask any tech support questions or general questions regarding any of FMA's products or Kokam LiPo batteries. A direct representative will be available to answer your questions.
Old 09-19-2004, 03:34 PM
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johnnycrash
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

I was wondering when the fs8 will be available at my local hobby shop
Old 11-26-2004, 10:36 PM
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leoyu
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

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Old 11-26-2004, 10:53 PM
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pc93254
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

What voltages will electric motors for airplanes except. Will a 6 volt motor work alright at 8.4 volts? Do you have to ask on every motor what the highest and lowest voltages are? I am very new at RC Airplanes.

Thanks
Phillip
pc93254@aol.com
Old 12-14-2004, 09:39 PM
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Fred Marks
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Philip,
Motors come in a broad range of capability. The major division is between brushed and brushless motors. A brushed motor that is designated as 4.8V, e.g., will generally burn up if you put 8.4V on it. Some brushless motors have a brioader range and could run at either voltage. It is best to select a motor that is designed to operate in the range of the voltage you intend to apply.
Old 01-27-2005, 02:47 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Sirs: I have a polymer 2200 with a Jeti 70 amp esc. I am using a Mega 22/20/2 motor with a Mini Demon gear box. With a 17x10 prop the battery gets very hot and mushy feeling. What is wrong? Thanks, Jon Kay
Old 02-28-2005, 09:25 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

will the kokam lipo-502 charger charge say a 3-cell 4000 mah lithium battery
Old 03-13-2005, 07:20 AM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

I am using Kokam 7.4v 1500 mah in my Estarter. It says not to get the batteries wet. Doesn that mean submerged wet? I plan on landing in snow so some moisture can touch the battery. Also may try floats so again some moisture.
Also, I am worried about storage. Can they be kept in an unheated shop that can get down to Zero and then be brought in to warm up overnight?
How about an airtight ammo can for storage? Thank-you. Larry
Old 03-14-2005, 01:05 PM
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Greg Covey
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Hi Larry,

Yes, you can get them wet without issue. I have never submerged them so I'm not sure what happens.

It is actually better to store Lithium cells at freezing temperatures when not in use. Doing so, keeps their capacity healthy. I keep mine in an unheated garage during the winter months and warm them up for a day if I decide to use them.

Since the Lithium packs are only volatile during charge, you can keep them in a cardboard box for storage.
Old 03-14-2005, 05:36 PM
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eggvoel
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Thanks Greg. I didn't think the hobby shops stored them in bullet proof containers, but after reading about some fires, etc., it pays to be cautious. Larry
Old 03-14-2005, 06:00 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

What LiPo would you recommend for a Lil Rascal with an Astro 010? ESC is what comes with the motor. I'm not new to R/C but I am to LiPo's. Don't really understand the terminology.
Old 03-15-2005, 03:54 PM
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Greg Covey
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

If you look at the [link=http://www.astroflight.com/e/env/0001tH4snX1NiPUtz408301/store/store-Brushless.html?link=/store/store-type-tem.html&item=products:af-801g]charts[/link] for the geared 010 on the Astro Flight site, you can see various current draw values for 2-3 cell Lithium packs using different props. This shows a general range from 4-8amps.

Since the Sig Lil Rascal is a small, under 10oz plane, you may wish to start with a lighter 2-cell pack and see if you have the desired power level you want . If not, use a 3-cell pack or a larger prop.

The new [link=https://www.fmadirect.com/site/fma.htm?body=Products&cat=28]Kokam 640mAh[/link] cell comes in 2 or 3 cell packs at FMA Direct. The 2-cell 640mAh pack weighs only 1.3oz (36g) and supports up to 9.6A continuous discharge which is a good match for the weight of the Lil Rascal plane and the AF 010 power system.
Old 03-15-2005, 06:57 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Thank you, I appreciate the assistance.
Old 03-20-2005, 08:11 AM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

I am using the 2c 1500 mah Kokam Lipo's in my Estarter. After about 20 minutes of flying time the plane is getting a little anemic so I land. The battery is discharged to about 7.4v. Should I run it down to the 5.3v with the ESC before charging or will it make a difference? Thank-you. 7 flights so far, having fun. Larry
Old 03-20-2005, 03:06 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

I would like to use a Li-Po in a glow airplane with a 6V regulator but the connectors from your Li-Po batteries don't mate with the switch or the regulator. How are people setting up glow airplanes with Li-Po batteries?
Old 03-21-2005, 12:01 AM
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Fred Marks
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

You need to look under the Kokam section of the catalog under Flight packs. They all use the universal conector that fits all radios. You must be looking at the electric airplane packs.
Old 03-24-2005, 12:08 PM
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eggvoel
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Do Lipo's have charge/discharge memory? I asked earlier about discharging my 2c1500mah Lipo's. With the 400 motor in my Estarter I get about 20 minutes flight time and then it is getting sluggish so I land. The battery is down to about 7.4 volts. should I discharge in down to the 5.3 volts on the BEC before charging?
Conversely, if I got a 3c pack and the motor is rated for 9.6v, can I charge up to 10v instead of the full charge? Thank-you. Larry
Old 03-24-2005, 02:55 PM
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Greg Covey
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Larry,

One of the several bonus features of Lithium cells is that you never have to cycle them or fear memory problems. Also, you can leave them charged for weeks without the need to re-peak them. Lithium cells are ready to fly when you are!

You can run the pack without a full charge. It has no ill effect other than a shorter flight. For a 3-cell pack, a full charge is 4.2v*3 or 12.6v.
Old 03-24-2005, 05:29 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Thank-you very much Greg. You and this site have been most helpful. Larry
Old 04-01-2005, 12:09 PM
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eggvoel
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Mix Lipo's & NIMH? What would happen if I put a AA type NIMH in series with a 2c1500mah Lipo. Would I get an increase in voltage and power without hurting anything? My Estarter with the 400 motor could use a little more zip. Of course they would be disconnected when charging. Just a thought, maybe foolish. Thank-you. Larry
Old 04-01-2005, 12:18 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

I have an e-starter that I use a 3 cell LIpo with. It's a good combination. I WOULD STRONGLY SUGGEST THAT YOU NOT MESS WITH LIPOS IN ANY WAY THAT IS OTHER THAN THE WAY THE FACTORY SETS THEM UP. THEY ARE EXTREMELY DANGEROUS IF USED, CHARGED OR DISCHARGED INCORRECTLY!! FIRES AND EXPLOSION ARE A POSSIBILITY!!
Old 04-01-2005, 05:36 PM
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eggvoel
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Thanks Mike. I don't need any more persuasion not to mess with the Lipo's. It was just a thought I had and that is why these forums are so great and important to us.
Old 04-05-2005, 05:43 PM
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Fred Marks
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Eggvoel,
You must not mix any battery chemistry, even Ni Cd to Ni MH. All have different characteristics. Charging the Ni Mh cells in series with the Li Po cells can cause an explosion of the Ni MH. Charging the Li Po cells with peak detection will certainly ruin the Li Po cells. Li Po handled per manufacturers directions are quite safe. Any cell handled improperly can be dangerous.
Old 04-05-2005, 07:04 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Hi Mark,

Three general questions about Kokam Li-Poly batteries:

1) What's the best maintenance when they are not used for several days

2) Do I need to "peak" them if they've not been not used for the week and I plan to fly on saturday morning?

3) What's the best charging rate to set on my Apache Charger? Any rule of thumb to determine this?

Old 04-05-2005, 07:17 PM
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Default RE: Welcome to the FMA Direct - Kokam LiPo Support Forum

Hi Larry,

I can share this unfortunate experience with you; the other day, my Decathlon went nuts and made an abrupt landing in the middle of the BallPark near my house. Due to the snow that melted in the previous days, there was about a foot of water[X(] where the plane crashed! it took me about 5 seconds to react, run like crazy and pick up the plane, getting my pants and brand new leather boots wet at the same time! Of course my first reflex was to disconnect power but the plane had been totally immerged in water.

Anyway, came home in a rush and used my air compressor to blow dry the plane, esc, receptor, servos, battery and Venom Fireball engine. Then used electrical connectors cleaner and dry air again to complete the job.

Guess what? Everything works well! Performed several tests since then and everything seems normal.

Luke

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